refactor(change): do API changes to buffer without curbuf switch

Most of the messy things when changing a non-current buffer is
not about the buffer, it is about windows. In particular, it is about
`curwin`.

When editing a non-current buffer which is displayed in some other
window in the current tabpage, one such window will be "borrowed" as the
curwin. But this means if two or more non-current windows displayed the buffers,
one of them will be treated differenty. this is not desirable.

In particular, with nvim_buf_set_text, cursor _column_ position was only
corrected for one single window. Two new tests are added: the test
with just one non-current window passes, but the one with two didn't.

Two corresponding such tests were also added for nvim_buf_set_lines.
This already worked correctly on master, but make sure this is
well-tested for future refactors.

Also, nvim_create_buf no longer invokes autocmds just because you happened
to use `scratch=true`. No option value was changed, therefore OptionSet
must not be fired.

4 files changed, 394 insertions, 251 deletions

diff --git a/test/functional/api/buffer_spec.lua b/test/functional/api/buffer_spec.lua
index 512a1a08a6..4784c0a9dd 100644
--- a/test/functional/api/buffer_spec.lua
+++ b/test/functional/api/buffer_spec.lua
@@ -76,6 +76,38 @@ describe('api/buf', function()
       eq({4, 2}, curwin('get_cursor'))
     end)
 
+    it('cursor position is maintained in non-current window', function()
+      meths.buf_set_lines(0, 0, -1, 1, {"line1", "line2", "line3", "line4"})
+      meths.win_set_cursor(0, {3, 2})
+      local win = meths.get_current_win()
+      local buf = meths.get_current_buf()
+
+      command('new')
+
+      meths.buf_set_lines(buf, 1, 2, 1, {"line5", "line6"})
+      eq({"line1", "line5", "line6", "line3", "line4"}, meths.buf_get_lines(buf, 0, -1, true))
+      eq({4, 2}, meths.win_get_cursor(win))
+    end)
+
+    it('cursor position is maintained in TWO non-current windows', function()
+      meths.buf_set_lines(0, 0, -1, 1, {"line1", "line2", "line3", "line4"})
+      meths.win_set_cursor(0, {3, 2})
+      local win = meths.get_current_win()
+      local buf = meths.get_current_buf()
+
+      command('split')
+      meths.win_set_cursor(0, {4, 2})
+      local win2 = meths.get_current_win()
+
+      -- set current window to third one with another buffer
+      command("new")
+
+      meths.buf_set_lines(buf, 1, 2, 1, {"line5", "line6"})
+      eq({"line1", "line5", "line6", "line3", "line4"}, meths.buf_get_lines(buf, 0, -1, true))
+      eq({4, 2}, meths.win_get_cursor(win))
+      eq({5, 2}, meths.win_get_cursor(win2))
+    end)
+
     it('line_count has defined behaviour for unloaded buffers', function()
       -- we'll need to know our bufnr for when it gets unloaded
       local bufnr = curbuf('get_number')
@@ -484,6 +516,50 @@ describe('api/buf', function()
       eq({1, 9}, curwin('get_cursor'))
     end)
 
+    it('updates the cursor position in non-current window', function()
+      insert([[
+      hello world!]])
+
+      -- position the cursor on `!`
+      meths.win_set_cursor(0, {1, 11})
+
+      local win = meths.get_current_win()
+      local buf = meths.get_current_buf()
+
+      command("new")
+
+      -- replace 'world' with 'foo'
+      meths.buf_set_text(buf, 0, 6, 0, 11, {'foo'})
+      eq({'hello foo!'}, meths.buf_get_lines(buf, 0, -1, true))
+      -- cursor should be moved left by two columns (replacement is shorter by 2 chars)
+      eq({1, 9}, meths.win_get_cursor(win))
+    end)
+
+    it('updates the cursor position in TWO non-current windows', function()
+      insert([[
+      hello world!]])
+
+      -- position the cursor on `!`
+      meths.win_set_cursor(0, {1, 11})
+      local win = meths.get_current_win()
+      local buf = meths.get_current_buf()
+
+      command("split")
+      local win2 = meths.get_current_win()
+      -- position the cursor on `w`
+      meths.win_set_cursor(0, {1, 6})
+
+      command("new")
+
+      -- replace 'hello' with 'foo'
+      meths.buf_set_text(buf, 0, 0, 0, 5, {'foo'})
+      eq({'foo world!'}, meths.buf_get_lines(buf, 0, -1, true))
+
+      -- both cursors should be moved left by two columns (replacement is shorter by 2 chars)
+      eq({1, 9}, meths.win_get_cursor(win))
+      eq({1, 4}, meths.win_get_cursor(win2))
+    end)
+
     it('can handle NULs', function()
       set_text(0, 0, 0, 0, {'ab\0cd'})
       eq('ab\0cd', curbuf_depr('get_line', 0))
diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index 7edf1d9cde..2de1990b14 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -28,7 +28,6 @@ local write_file = helpers.write_file
 local exec_lua = helpers.exec_lua
 local exc_exec = helpers.exc_exec
 local insert = helpers.insert
-local expect_exit = helpers.expect_exit
 local skip = helpers.skip
 
 local pcall_err = helpers.pcall_err
@@ -2832,7 +2831,9 @@ describe('API', function()
 
     it('does not cause heap-use-after-free on exit while setting options', function()
       command('au OptionSet * q')
-      expect_exit(command, 'silent! call nvim_create_buf(0, 1)')
+      command('silent! call nvim_create_buf(0, 1)')
+      -- nowadays this works because we don't execute any spurious autocmds at all #24824
+      assert_alive()
     end)
   end)
 
diff --git a/test/functional/ui/diff_spec.lua b/test/functional/ui/diff_spec.lua
index 0f551e3044..92b7235885 100644
--- a/test/functional/ui/diff_spec.lua
+++ b/test/functional/ui/diff_spec.lua
@@ -1251,6 +1251,98 @@ AAAB]]
       ]]}
     end)
   end)
+
+  it('redraws with a change to non-current buffer', function()
+    write_file(fname, "aaa\nbbb\nccc\n\nxx", false)
+    write_file(fname_2, "aaa\nbbb\nccc\n\nyy", false)
+    reread()
+    local buf = meths.get_current_buf()
+    command('botright new')
+    screen:expect{grid=[[
+      {1:  }aaa               │{1:  }aaa              |
+      {1:  }bbb               │{1:  }bbb              |
+      {1:  }ccc               │{1:  }ccc              |
+      {1:  }                  │{1:  }                 |
+      {1:  }{8:xx}{9:                }│{1:  }{8:yy}{9:               }|
+      {6:~                   }│{6:~                  }|
+      {3:<onal-diff-screen-1  <l-diff-screen-1.2 }|
+      ^                                        |
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {7:[No Name]                               }|
+      :e                                      |
+    ]]}
+
+    meths.buf_set_lines(buf, 1, 2, true, {'BBB'})
+    screen:expect{grid=[[
+      {1:  }aaa               │{1:  }aaa              |
+      {1:  }{8:BBB}{9:               }│{1:  }{8:bbb}{9:              }|
+      {1:  }ccc               │{1:  }ccc              |
+      {1:  }                  │{1:  }                 |
+      {1:  }{8:xx}{9:                }│{1:  }{8:yy}{9:               }|
+      {6:~                   }│{6:~                  }|
+      {3:<-diff-screen-1 [+]  <l-diff-screen-1.2 }|
+      ^                                        |
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {6:~                                       }|
+      {7:[No Name]                               }|
+      :e                                      |
+    ]]}
+  end)
+
+ it('redraws with a change current buffer in another window', function()
+    write_file(fname, "aaa\nbbb\nccc\n\nxx", false)
+    write_file(fname_2, "aaa\nbbb\nccc\n\nyy", false)
+    reread()
+    local buf = meths.get_current_buf()
+    command('botright split | diffoff')
+    screen:expect{grid=[[
+      {1:  }aaa               │{1:  }aaa              |
+      {1:  }bbb               │{1:  }bbb              |
+      {1:  }ccc               │{1:  }ccc              |
+      {1:  }                  │{1:  }                 |
+      {1:  }{8:xx}{9:                }│{1:  }{8:yy}{9:               }|
+      {6:~                   }│{6:~                  }|
+      {3:<onal-diff-screen-1  <l-diff-screen-1.2 }|
+      ^aaa                                     |
+      bbb                                     |
+      ccc                                     |
+                                              |
+      xx                                      |
+      {6:~                                       }|
+      {6:~                                       }|
+      {7:Xtest-functional-diff-screen-1          }|
+      :e                                      |
+    ]]}
+
+    meths.buf_set_lines(buf, 1, 2, true, {'BBB'})
+    screen:expect{grid=[[
+      {1:  }aaa               │{1:  }aaa              |
+      {1:  }{8:BBB}{9:               }│{1:  }{8:bbb}{9:              }|
+      {1:  }ccc               │{1:  }ccc              |
+      {1:  }                  │{1:  }                 |
+      {1:  }{8:xx}{9:                }│{1:  }{8:yy}{9:               }|
+      {6:~                   }│{6:~                  }|
+      {3:<-diff-screen-1 [+]  <l-diff-screen-1.2 }|
+      ^aaa                                     |
+      BBB                                     |
+      ccc                                     |
+                                              |
+      xx                                      |
+      {6:~                                       }|
+      {6:~                                       }|
+      {7:Xtest-functional-diff-screen-1 [+]      }|
+      :e                                      |
+    ]]}
+  end)
 end)
 
 it('win_update redraws lines properly', function()
diff --git a/test/functional/ui/float_spec.lua b/test/functional/ui/float_spec.lua
index c2bcac2449..85795e7e17 100644
--- a/test/functional/ui/float_spec.lua
+++ b/test/functional/ui/float_spec.lua
@@ -1445,16 +1445,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔═════════╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1488,16 +1488,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:┌─────────┐}|
           {5:│}{1: halloj! }{5:│}|
           {5:│}{1: BORDAA  }{5:│}|
           {5:└─────────┘}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1531,16 +1531,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╭─────────╮}|
           {5:│}{1: halloj! }{5:│}|
           {5:│}{1: BORDAA  }{5:│}|
           {5:╰─────────╯}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1574,16 +1574,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:           }|
           {5: }{1: halloj! }{5: }|
           {5: }{1: BORDAA  }{5: }|
           {5:           }|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1618,16 +1618,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:x}{7:ååååååååå}{5:\}|
           {17:n̈̊}{1: halloj! }{17:n̈̊}|
           {17:n̈̊}{1: BORDAA  }{17:n̈̊}|
           {5:\}{7:ååååååååå}{5:x}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1661,14 +1661,14 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1: halloj! }|
           {1: BORDAA  }|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1702,14 +1702,14 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:<}{1: halloj! }{5:>}|
           {5:<}{1: BORDAA  }{5:>}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1743,16 +1743,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:_________}|
           {1: halloj! }|
           {1: BORDAA  }|
           {5:---------}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1794,15 +1794,15 @@ describe('float window', function()
           ^                                        |
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1: halloj! }{25: }|
           {1: BORDAA  }{26: }|
           {25: }{26:         }|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 6, curline = 5, curcol = 0, linecount = 6, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1880,16 +1880,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔}{11:Left}{5:═════╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1923,16 +1923,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔═}{11:Center}{5:══╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -1966,16 +1966,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔════}{11:Right}{5:╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2009,16 +2009,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔═════}🦄BB{5:╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 1, 2, 5, true }
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2117,17 +2117,17 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔═════════╗}|
           {5:║}{1:aaa aab  }{5:║}|
           {5:║}{1:abb acc  }{5:║}|
           {5:║}{1:^         }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 0, 5, true };
+          [4] = { { id = 1001 }, "NW", 1, 0, 5, true };
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 2, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 2, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2170,23 +2170,23 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
           {3:-- }{8:match 1 of 4}                         |
-        ## grid 5
+        ## grid 4
           {5:╔═════════╗}|
           {5:║}{1:aaa aab  }{5:║}|
           {5:║}{1:abb acc  }{5:║}|
           {5:║}{1:acc^      }{5:║}|
           {5:╚═════════╝}|
-        ## grid 6
+        ## grid 5
           {1: aaa            }|
           {1: aab            }|
           {1: abb            }|
           {13: acc            }|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 0, 5, true, 50 };
-          [6] = { { id = -1 }, "NW", 5, 4, 0, false, 100 };
+          [4] = { { id = 1001 }, "NW", 1, 0, 5, true, 50 };
+          [5] = { { id = -1 }, "NW", 4, 4, 0, false, 100 };
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount=1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 2, curcol = 3, linecount=3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 2, curcol = 3, linecount=3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2229,17 +2229,17 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:╔═════════╗}|
           {5:║}{1:aaa aab  }{5:║}|
           {5:║}{1:abb acc  }{5:║}|
           {5:║}{1:ac^c      }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 0, 5, true };
+          [4] = { { id = 1001 }, "NW", 1, 0, 5, true };
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 2, curcol = 2, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 2, curcol = 2, linecount = 3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2287,22 +2287,22 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
           :popup Test                             |
-        ## grid 5
+        ## grid 4
           {5:╔═════════╗}|
           {5:║}{1:aaa aab  }{5:║}|
           {5:║}{1:abb acc  }{5:║}|
           {5:║}{1:ac^c      }{5:║}|
           {5:╚═════════╝}|
-        ## grid 6
+        ## grid 5
           {1: foo }|
           {1: bar }|
           {1: baz }|
         ]], float_pos={
-          [5] = { { id = 1002 }, "NW", 1, 0, 5, true };
-          [6] = { { id = -1 }, "NW", 5, 4, 2, false, 250 };
+          [4] = { { id = 1001 }, "NW", 1, 0, 5, true };
+          [5] = { { id = -1 }, "NW", 4, 4, 2, false, 250 };
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 2, curcol = 2, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 2, curcol = 2, linecount = 3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2347,15 +2347,15 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                 1,1           All |
-        ## grid 5
+        ## grid 4
           {1:^aaa aab  }|
           {1:abb acc  }|
           {2:~        }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 0, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 0, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2389,15 +2389,15 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                 1,5           All |
-        ## grid 5
+        ## grid 4
           {1:aaa ^aab  }|
           {1:abb acc  }|
           {2:~        }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 0, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 0, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 4, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 4, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -2596,10 +2596,10 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:x}|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 2, 0, 4, false}
+          [4] = {{id = 1001}, "NW", 2, 0, 4, false}
         }}
       else
         screen:expect([[
@@ -2633,10 +2633,10 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:x}|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 2, 0, 15, false}
+          [4] = {{id = 1001}, "NW", 2, 0, 15, false}
         }}
       else
         screen:expect([[
@@ -3132,13 +3132,13 @@ describe('float window', function()
           {0:~                                       }|
           {0:~                                       }|
           {0:~                                       }|
-        ## grid 6
+        ## grid 5
           {5:╔═════════╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [6] = {{id = 1003}, "NW", 4, 1, 14, true}
+          [5] = {{id = 1002}, "NW", 4, 1, 14, true}
         }}
       else
         screen:expect([[
@@ -3189,13 +3189,13 @@ describe('float window', function()
           {0:~                                       }|
           {0:~                                       }|
           {0:~                                       }|
-        ## grid 6
+        ## grid 5
           {5:╔═════════╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [6] = {{id = 1003}, "NE", 4, 0, 14, true}
+          [5] = {{id = 1002}, "NE", 4, 0, 14, true}
         }}
       else
         screen:expect([[
@@ -3246,13 +3246,13 @@ describe('float window', function()
           {0:~                                       }|
           {0:~                                       }|
           {0:~                                       }|
-        ## grid 6
+        ## grid 5
           {5:╔═════════╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [6] = {{id = 1003}, "SE", 4, 1, 14, true}
+          [5] = {{id = 1002}, "SE", 4, 1, 14, true}
         }}
       else
         screen:expect([[
@@ -3303,13 +3303,13 @@ describe('float window', function()
           {0:~                                       }|
           {0:~                                       }|
           {0:~                                       }|
-        ## grid 6
+        ## grid 5
           {5:╔═════════╗}|
           {5:║}{1: halloj! }{5:║}|
           {5:║}{1: BORDAA  }{5:║}|
           {5:╚═════════╝}|
         ]], float_pos={
-          [6] = {{id = 1003}, "SW", 4, 0, 14, true}
+          [5] = {{id = 1002}, "SW", 4, 0, 14, true}
         }}
       else
         screen:expect([[
@@ -3379,12 +3379,10 @@ describe('float window', function()
                                         |
         ## grid 3
                                         |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 3, 2, true }
+          [4] = { { id = 1001 }, "NW", 2, 3, 2, true }
         }}
       else
         screen:expect{grid=[[
@@ -3414,12 +3412,10 @@ describe('float window', function()
                                         |
         ## grid 3
                                         |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 2, 2, true }
+          [4] = { { id = 1001 }, "NW", 2, 2, 2, true },
         }}
       else
         screen:expect{grid=[[
@@ -3448,12 +3444,10 @@ describe('float window', function()
           more text                                    |
         ## grid 3
                                                        |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 1, 32, true }
+          [4] = { { id = 1001 }, "NW", 2, 1, 32, true }
         }}
       else
         -- note: appears misaligned due to cursor
@@ -3492,12 +3486,10 @@ describe('float window', function()
           {0:~                        }|
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 2, 7, true }
+          [4] = { { id = 1001 }, "NW", 2, 2, 7, true }
         }}
       else
         screen:expect{grid=[[
@@ -3540,12 +3532,10 @@ describe('float window', function()
           {0:~                        }|
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "SW", 2, 1, 7, true }
+          [4] = { { id = 1001 }, "SW", 2, 1, 7, true }
         }}
       else
         screen:expect{grid=[[
@@ -3567,15 +3557,15 @@ describe('float window', function()
       if multigrid then
         screen:expect{grid=[[
         ## grid 1
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
-          [2:----]{5:│}[6:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
+          [2:----]{5:│}[5:--------------------]|
           [3:-------------------------]|
         ## grid 2
           exam|
@@ -3589,9 +3579,9 @@ describe('float window', function()
           the |
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
-        ## grid 6
+        ## grid 5
           ^                    |
           {0:~                   }|
           {0:~                   }|
@@ -3602,9 +3592,7 @@ describe('float window', function()
           {0:~                   }|
           {0:~                   }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "SW", 2, 8, 0, true }
+          [4] = { { id = 1001 }, "SW", 2, 8, 0, true }
         }}
       else
         screen:expect{grid=[[
@@ -3648,12 +3636,10 @@ describe('float window', function()
           {0:~                        }|
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 2, 5, true }
+          [4] = { { id = 1001 }, "NW", 2, 2, 5, true }
         }}
       else
         screen:expect{grid=[[
@@ -3696,12 +3682,10 @@ describe('float window', function()
           {0:~                        }|
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 3, 7, true }
+          [4] = { { id = 1001 }, "NW", 2, 3, 7, true }
         }}
       else
         screen:expect{grid=[[
@@ -3744,12 +3728,10 @@ describe('float window', function()
           {0:~                        }|
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:some info!  }|
         ]], float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 2, 2, 0, true }
+          [4] = { { id = 1001 }, "NW", 2, 2, 0, true }
         }}
       else
         screen:expect{grid=[[
@@ -3815,10 +3797,10 @@ describe('float window', function()
           {0:~                             }|
         ## grid 3
                                         |
-        ## grid 5
+        ## grid 4
           {1:some floaty text    }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 3, 1, true}
+          [4] = {{id = 1001}, "NW", 1, 3, 1, true}
         }}
       else
         screen:expect([[
@@ -3874,7 +3856,7 @@ describe('float window', function()
       meths.buf_set_lines(buf, 0, -1, true, {'such', 'very', 'float'})
       local win = meths.open_win(buf, false, {relative='editor', width=15, height=4, row=2, col=10})
       local expected_pos = {
-          [5]={{id=1002}, 'NW', 1, 2, 10, true},
+          [4]={{id=1001}, 'NW', 1, 2, 10, true},
       }
       if multigrid then
         screen:expect{grid=[[
@@ -3895,7 +3877,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:such           }|
           {1:very           }|
           {1:float          }|
@@ -3929,7 +3911,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:such           }|
           {1:very           }|
           {1:float          }|
@@ -3959,7 +3941,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:such           }|
           {1:very           }|
           {1:float          }|
@@ -3986,7 +3968,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:such           }|
           {1:very           }|
           {1:float          }|
@@ -4011,7 +3993,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:such           }|
           {1:very           }|
           {1:^float          }|
@@ -4045,7 +4027,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:such           }|
           {1:very           }|
           {1:^float          }|
@@ -4084,7 +4066,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4121,7 +4103,7 @@ describe('float window', function()
           {0:~                         }|
         ## grid 3
                                     |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4158,7 +4140,7 @@ describe('float window', function()
           {0:~                        }|
         ## grid 3
                                    |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4195,7 +4177,7 @@ describe('float window', function()
           {0:~                       }|
         ## grid 3
                                   |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4232,7 +4214,7 @@ describe('float window', function()
           {0:~               }|
         ## grid 3
                           |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4269,7 +4251,7 @@ describe('float window', function()
           {0:~              }|
         ## grid 3
                          |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4306,7 +4288,7 @@ describe('float window', function()
           {0:~             }|
         ## grid 3
                         |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4343,7 +4325,7 @@ describe('float window', function()
           {0:~           }|
         ## grid 3
                       |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4371,7 +4353,7 @@ describe('float window', function()
                       |
         ## grid 3
                       |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -4403,7 +4385,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:^such           }|
           {1:very           }|
           {1:float          }|
@@ -5063,12 +5045,12 @@ describe('float window', function()
             {13:aa             }|
             {1:word           }|
             {1:longtext       }|
-          ## grid 6
+          ## grid 5
             {15:some info   }|
             {15:about item  }|
           ]], float_pos={
             [4] = {{id = -1}, "NW", 2, 1, 0, false, 100},
-            [6] = {{id = 1002}, "NW", 2, 1, 12, true, 50},
+            [5] = {{id = 1001}, "NW", 2, 1, 12, true, 50},
           }}
         else
           screen:expect([[
@@ -5104,11 +5086,11 @@ describe('float window', function()
             {0:~                                       }|
           ## grid 3
             {3:-- INSERT --}                            |
-          ## grid 6
+          ## grid 5
             {15:some info   }|
             {15:about item  }|
           ]], float_pos={
-            [6] = {{id = 1002}, "NW", 2, 1, 12, true},
+            [5] = {{id = 1001}, "NW", 2, 1, 12, true},
           }}
         else
           screen:expect([[
@@ -5256,14 +5238,14 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           here                |
           float               |
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 2, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 2, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 2, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -7580,18 +7562,18 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:foo                 }|
           {1:bar                 }|
           {1:baz                 }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 2, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 2, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
 
-        meths.input_mouse('left', 'press', '', 5, 0, 0)
+        meths.input_mouse('left', 'press', '', 4, 0, 0)
         screen:expect{grid=[[
         ## grid 1
           [2:----------------------------------------]|
@@ -7610,18 +7592,18 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:^foo                 }|
           {1:bar                 }|
           {1:baz                 }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 2, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 2, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
 
-        meths.input_mouse('left', 'drag', '', 5, 1, 2)
+        meths.input_mouse('left', 'drag', '', 4, 1, 2)
         screen:expect{grid=[[
         ## grid 1
           [2:----------------------------------------]|
@@ -7640,15 +7622,15 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
           {3:-- VISUAL --}                            |
-        ## grid 5
+        ## grid 4
           {27:foo}{1:                 }|
           {27:ba}{1:^r                 }|
           {1:baz                 }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 2, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 2, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 1, curcol = 2, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 1, curcol = 2, linecount = 3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -7708,20 +7690,20 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────┐}|
           {5:│}{1:foo                 }{5:│}|
           {5:│}{1:bar                 }{5:│}|
           {5:│}{1:baz                 }{5:│}|
           {5:└────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 0, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 0, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
 
-        meths.input_mouse('left', 'press', '', 5, 1, 1)
+        meths.input_mouse('left', 'press', '', 4, 1, 1)
         screen:expect{grid=[[
         ## grid 1
           [2:----------------------------------------]|
@@ -7740,20 +7722,20 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────┐}|
           {5:│}{1:^foo                 }{5:│}|
           {5:│}{1:bar                 }{5:│}|
           {5:│}{1:baz                 }{5:│}|
           {5:└────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 0, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 0, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
 
-        meths.input_mouse('left', 'drag', '', 5, 2, 3)
+        meths.input_mouse('left', 'drag', '', 4, 2, 3)
         screen:expect{grid=[[
         ## grid 1
           [2:----------------------------------------]|
@@ -7772,17 +7754,17 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
           {3:-- VISUAL --}                            |
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────┐}|
           {5:│}{27:foo}{1:                 }{5:│}|
           {5:│}{27:ba}{1:^r                 }{5:│}|
           {5:│}{1:baz                 }{5:│}|
           {5:└────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 0, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 0, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 1, curcol = 2, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 1, curcol = 2, linecount = 3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -7843,19 +7825,19 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {3:floaty bar          }|
           {1:foo                 }|
           {1:bar                 }|
           {1:baz                 }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 1, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 1, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
 
-        meths.input_mouse('left', 'press', '', 5, 1, 0)
+        meths.input_mouse('left', 'press', '', 4, 1, 0)
         screen:expect{grid=[[
         ## grid 1
           [2:----------------------------------------]|
@@ -7874,19 +7856,19 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {3:floaty bar          }|
           {1:^foo                 }|
           {1:bar                 }|
           {1:baz                 }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 1, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 1, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 0, curcol = 0, linecount = 3, sum_scroll_delta = 0};
         }}
 
-        meths.input_mouse('left', 'drag', '', 5, 2, 2)
+        meths.input_mouse('left', 'drag', '', 4, 2, 2)
         screen:expect{grid=[[
         ## grid 1
           [2:----------------------------------------]|
@@ -7905,16 +7887,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
           {3:-- VISUAL --}                            |
-        ## grid 5
+        ## grid 4
           {3:floaty bar          }|
           {27:foo}{1:                 }|
           {27:ba}{1:^r                 }|
           {1:baz                 }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 1, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 1, 5, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 3, curline = 1, curcol = 2, linecount = 3, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 3, curline = 1, curcol = 2, linecount = 3, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -7959,11 +7941,11 @@ describe('float window', function()
       if multigrid then
         screen:expect([[
         ## grid 1
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
           {5:[No Name]           }{4:[No Name] [+]       }|
           [3:----------------------------------------]|
         ## grid 2
@@ -7974,7 +7956,7 @@ describe('float window', function()
           {0:~                  }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           ^foo                 |
           bar                 |
           baz                 |
@@ -7982,14 +7964,14 @@ describe('float window', function()
           {0:~                   }|
         ]])
 
-        meths.input_mouse('left', 'press', '', 5, 2, 2)
+        meths.input_mouse('left', 'press', '', 4, 2, 2)
         screen:expect([[
         ## grid 1
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
           {5:[No Name]           }{4:[No Name] [+]       }|
           [3:----------------------------------------]|
         ## grid 2
@@ -8000,7 +7982,7 @@ describe('float window', function()
           {0:~                  }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           foo                 |
           bar                 |
           ba^z                 |
@@ -8008,14 +7990,14 @@ describe('float window', function()
           {0:~                   }|
         ]])
 
-        meths.input_mouse('left', 'drag', '', 5, 1, 1)
+        meths.input_mouse('left', 'drag', '', 4, 1, 1)
         screen:expect([[
         ## grid 1
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
-          [2:-------------------]{5:│}[5:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
+          [2:-------------------]{5:│}[4:--------------------]|
           {5:[No Name]           }{4:[No Name] [+]       }|
           [3:----------------------------------------]|
         ## grid 2
@@ -8026,7 +8008,7 @@ describe('float window', function()
           {0:~                  }|
         ## grid 3
           {3:-- VISUAL --}                            |
-        ## grid 5
+        ## grid 4
           foo                 |
           b^a{27:r}                 |
           {27:baz}                 |
@@ -8125,11 +8107,11 @@ describe('float window', function()
           laborum^.                                          |
         ## grid 3
                                                             |
-        ## grid 5
+        ## grid 4
           {1:test           }|
           {1:               }|
           {1:popup    text  }|
-        ]], float_pos={[5] = {{id = 1002}, "NW", 1, 2, 5, true}}}
+        ]], float_pos={[4] = {{id = 1001}, "NW", 1, 2, 5, true}}}
       else
         screen:expect([[
           Ut enim ad minim veniam, quis nostrud             |
@@ -8168,11 +8150,11 @@ describe('float window', function()
           laborum^.                                          |
         ## grid 3
                                                             |
-        ## grid 5
+        ## grid 4
           {9:test           }|
           {9:               }|
           {9:popup    text  }|
-        ]], float_pos={[5] = {{id = 1002}, "NW", 1, 2, 5, true}}, unchanged=true}
+        ]], float_pos={[4] = {{id = 1001}, "NW", 1, 2, 5, true}}, unchanged=true}
       else
         screen:expect([[
           Ut enim ad minim veniam, quis nostrud             |
@@ -8212,12 +8194,12 @@ describe('float window', function()
           laborum^.                                          |
         ## grid 3
                                                             |
-        ## grid 5
+        ## grid 4
           {13:test           }|
           {13:               }|
           {13:popup    text  }|
         ]], float_pos={
-          [5] = {{id = 1002}, "NW", 1, 2, 5, true, 50};
+          [4] = {{id = 1001}, "NW", 1, 2, 5, true, 50};
         }}
       else
         screen:expect([[
@@ -8264,11 +8246,11 @@ describe('float window', function()
           laborum^.                                          |
         ## grid 3
                                                             |
-        ## grid 5
+        ## grid 4
           {9:test           }|
           {9:               }|
           {10:popup    text}{9:  }|
-        ]], float_pos={[5] = {{id = 1002}, "NW", 1, 2, 5, true}}}
+        ]], float_pos={[4] = {{id = 1001}, "NW", 1, 2, 5, true}}}
       else
         screen:expect([[
           Ut enim ad minim veniam, quis nostrud             |
@@ -8307,11 +8289,11 @@ describe('float window', function()
           laborum^.                                          |
         ## grid 3
                                                             |
-        ## grid 5
+        ## grid 4
           {9:test           }|
           {9:               }|
           {11:popup    text}{9:  }|
-        ]], float_pos={[5] = {{id = 1002}, "NW", 1, 2, 5, true}}, unchanged=true}
+        ]], float_pos={[4] = {{id = 1001}, "NW", 1, 2, 5, true}}, unchanged=true}
       else
         screen:expect([[
           Ut enim ad minim veniam, quis nostrud             |
@@ -8328,7 +8310,7 @@ describe('float window', function()
 
       -- Test scrolling by mouse
       if multigrid then
-        meths.input_mouse('wheel', 'down', '', 5, 2, 2)
+        meths.input_mouse('wheel', 'down', '', 4, 2, 2)
         screen:expect{grid=[[
         ## grid 1
           [2:--------------------------------------------------]|
@@ -8351,11 +8333,11 @@ describe('float window', function()
           laborum^.                                          |
         ## grid 3
                                                             |
-        ## grid 5
+        ## grid 4
           {11:popup    text}{9:  }|
           {12:~              }|
           {12:~              }|
-        ]], float_pos={[5] = {{id = 1002}, "NW", 1, 2, 5, true}}}
+        ]], float_pos={[4] = {{id = 1001}, "NW", 1, 2, 5, true}}}
       else
         meths.input_mouse('wheel', 'down', '', 0, 4, 7)
         screen:expect([[
@@ -8398,11 +8380,11 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {1:口   }|
           {1:口   }|
           {1:     }|
-        ]], float_pos={ [5] = { { id = 1002 }, "NW", 1, 0, 11, true } }}
+        ]], float_pos={ [4] = { { id = 1001 }, "NW", 1, 0, 11, true } }}
       else
         screen:expect([[
           # TODO: 测 {1:口   }信息的准确性            |
@@ -8480,14 +8462,12 @@ describe('float window', function()
           {3:~                                       }|
         ## grid 3
                                                   |
-        ## grid 6
+        ## grid 5
           {5: x x  x   xx}|
           {5:  x x  x   x}|
           {5:            }|
         ]], float_pos={
-          [6] = { {
-              id = 1003
-            }, "NW", 1, 0, 11, true }
+          [5] = { { id = 1002 }, "NW", 1, 0, 11, true }
         }}
       else
         screen:expect([[
@@ -8521,14 +8501,12 @@ describe('float window', function()
           {3:~                                       }|
         ## grid 3
                                                   |
-        ## grid 6
+        ## grid 5
           {5: x x  x   xx}|
           {5:  x x  x   x}|
           {5:            }|
         ]], float_pos={
-          [6] = { {
-              id = 1003
-            }, "NW", 1, 0, 12, true }
+          [5] = { { id = 1002 }, "NW", 1, 0, 12, true }
         }}
       else
         screen:expect([[
@@ -8590,11 +8568,11 @@ describe('float window', function()
 		  {1:~                                       }|
 		## grid 3
 		                                          |
-		## grid 5
+		## grid 4
 		  {2:^long   }|
 		  {2:longer }|
 		  {2:longest}|
-		## grid 6
+		## grid 5
 		  {2:---------}|
 		  {2:-       -}|
 		  {2:-       -}|
@@ -8604,11 +8582,11 @@ describe('float window', function()
           [1] = {foreground = Screen.colors.Blue1, bold = true};
           [2] = {background = Screen.colors.LightMagenta};
         }, float_pos={
+           [4] = { {
+               id = 1001
+             }, "NW", 1, 1, 1, true },
            [5] = { {
                id = 1002
-             }, "NW", 1, 1, 1, true },
-           [6] = { {
-               id = 1003
              }, "NW", 1, 0, 0, true }
         }}
       else
@@ -8658,11 +8636,11 @@ describe('float window', function()
           {1:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {2:^l}|
           {2:o}|
           {2:n}|
-        ## grid 6
+        ## grid 5
           {2:---}|
           {2:- -}|
           {2:- -}|
@@ -8672,12 +8650,8 @@ describe('float window', function()
           [1] = {foreground = Screen.colors.Blue1, bold = true};
           [2] = {background = Screen.colors.LightMagenta};
         }, float_pos={
-          [5] = { {
-              id = 1002
-            }, "NW", 1, 1, 1, true },
-          [6] = { {
-              id = 1003
-            }, "NW", 1, 0, 0, true }
+          [4] = { { id = 1001 }, "NW", 1, 1, 1, true },
+          [5] = { { id = 1002 }, "NW", 1, 0, 0, true }
         }}
       else
         screen:expect([[
@@ -9088,7 +9062,7 @@ describe('float window', function()
           {0:~                                       }|
           {0:~                                       }|
         ## grid 3
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────────────────────────┐}|
           {5:│}{1:                                        }{5:│}|
           {5:│}{1:                                        }{5:│}|
@@ -9096,10 +9070,10 @@ describe('float window', function()
           {5:│}{1:                                        }{5:│}|
           {5:└────────────────────────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "SW", 1, 9, 0, true, 50};
+          [4] = {{id = 1001}, "SW", 1, 9, 0, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -9144,16 +9118,16 @@ describe('float window', function()
           {0:~                                       }|
           {0:~                                       }|
         ## grid 3
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────────────────────────┐}|
           {5:│}{1:                                        }{5:│}|
           {5:│}{1:                                        }{5:│}|
           {5:└────────────────────────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "SW", 1, 9, 0, true, 50};
+          [4] = {{id = 1001}, "SW", 1, 9, 0, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -9240,7 +9214,7 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────────────────────────┐}|
           {5:│}{1:                                        }{5:│}|
           {5:│}{1:                                        }{5:│}|
@@ -9248,10 +9222,10 @@ describe('float window', function()
           {5:│}{1:                                        }{5:│}|
           {5:└────────────────────────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "SW", 1, 8, 0, true, 50};
+          [4] = {{id = 1001}, "SW", 1, 8, 0, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -9300,7 +9274,7 @@ describe('float window', function()
         ## grid 3
                                                   |
           {8:Press ENTER or type command to continue}^ |
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────────────────────────┐}|
           {5:│}{1:                                        }{5:│}|
           {5:│}{1:                                        }{5:│}|
@@ -9308,10 +9282,10 @@ describe('float window', function()
           {5:│}{1:                                        }{5:│}|
           {5:└────────────────────────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "SW", 1, 8, 0, true, 50};
+          [4] = {{id = 1001}, "SW", 1, 8, 0, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[
@@ -9351,16 +9325,16 @@ describe('float window', function()
           {0:~                                       }|
         ## grid 3
                                                   |
-        ## grid 5
+        ## grid 4
           {5:┌────────────────────────────────────────┐}|
           {5:│}{1:                                        }{5:│}|
           {5:│}{1:                                        }{5:│}|
           {5:└────────────────────────────────────────┘}|
         ]], float_pos={
-          [5] = {{id = 1002}, "SW", 1, 8, 0, true, 50};
+          [4] = {{id = 1001}, "SW", 1, 8, 0, true, 50};
         }, win_viewport={
           [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
-          [5] = {win = {id = 1002}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1, sum_scroll_delta = 0};
         }}
       else
         screen:expect{grid=[[