vim-patch:8.1.0999: use register one too often and not properly tested

Problem:    Use register one too often and not properly tested.
Solution:   Do not always use register one when specifying a register.
            (closes vim/vim#4085)  Add more tests.
https://github.com/vim/vim/commit/9d7fdd403a3a9ee0d008b6dcbcd2ecc9ec0f57b7

3 files changed, 98 insertions, 13 deletions

diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index a18c6e126a..23db7fe5a3 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -1582,12 +1582,10 @@ int op_delete(oparg_T *oap)
       did_yank = true;
     }
 
-    /*
-     * Put deleted text into register 1 and shift number registers if the
-     * delete contains a line break, or when a regname has been specified.
-     */
-    if (oap->regname != 0 || oap->motion_type == kMTLineWise
-        || oap->line_count > 1 || oap->use_reg_one) {
+    // Put deleted text into register 1 and shift number registers if the
+    // delete contains a line break, or when using a specific operator (Vi
+    // compatible)
+    if (oap->motion_type == kMTLineWise || oap->line_count > 1 || oap->use_reg_one) {
       shift_delete_registers(is_append_register(oap->regname));
       reg = &y_regs[1];
       op_yank_reg(oap, false, reg, false);
diff --git a/src/nvim/testdir/test_registers.vim b/src/nvim/testdir/test_registers.vim
index ecc65b240b..f78b748d71 100644
--- a/src/nvim/testdir/test_registers.vim
+++ b/src/nvim/testdir/test_registers.vim
@@ -62,7 +62,6 @@ func Test_display_registers()
     call assert_match('^\nType Name Content\n'
           \ .         '  c  ""   a\n'
           \ .         '  c  "0   ba\n'
-          \ .         '  c  "1   b\n'
           \ .         '  c  "a   b\n'
           \ .         '.*'
           \ .         '  c  "-   a\n'
@@ -85,6 +84,90 @@ func Test_display_registers()
     let g:clipboard = save_clipboard
 endfunc
 
+func Test_register_one()
+  " delete a line goes into register one
+  new
+  call setline(1, "one")
+  normal dd
+  call assert_equal("one\n", @1)
+
+  " delete a word does not change register one, does change "-
+  call setline(1, "two")
+  normal de
+  call assert_equal("one\n", @1)
+  call assert_equal("two", @-)
+
+  " delete a word with a register does not change register one
+  call setline(1, "three")
+  normal "ade
+  call assert_equal("three", @a)
+  call assert_equal("one\n", @1)
+
+  " delete a word with register DOES change register one with one of a list of
+  " operators
+  " %
+  call setline(1, ["(12)3"])
+  normal "ad%
+  call assert_equal("(12)", @a)
+  call assert_equal("(12)", @1)
+
+  " (
+  call setline(1, ["first second"])
+  normal $"ad(
+  call assert_equal("first secon", @a)
+  call assert_equal("first secon", @1)
+
+  " )
+  call setline(1, ["First Second."])
+  normal gg0"ad)
+  call assert_equal("First Second.", @a)
+  call assert_equal("First Second.", @1)
+
+  " `
+  call setline(1, ["start here."])
+  normal gg0fhmx0"ad`x
+  call assert_equal("start ", @a)
+  call assert_equal("start ", @1)
+
+  " /
+  call setline(1, ["searchX"])
+  exe "normal gg0\"ad/X\<CR>"
+  call assert_equal("search", @a)
+  call assert_equal("search", @1)
+
+  " ?
+  call setline(1, ["Ysearch"])
+  exe "normal gg$\"ad?Y\<CR>"
+  call assert_equal("Ysearc", @a)
+  call assert_equal("Ysearc", @1)
+
+  " n
+  call setline(1, ["Ynext"])
+  normal gg$"adn
+  call assert_equal("Ynex", @a)
+  call assert_equal("Ynex", @1)
+
+  " N
+  call setline(1, ["prevY"])
+  normal gg0"adN
+  call assert_equal("prev", @a)
+  call assert_equal("prev", @1)
+
+  " }
+  call setline(1, ["one", ""])
+  normal gg0"ad}
+  call assert_equal("one\n", @a)
+  call assert_equal("one\n", @1)
+
+  " {
+  call setline(1, ["", "two"])
+  normal 2G$"ad{
+  call assert_equal("\ntw", @a)
+  call assert_equal("\ntw", @1)
+
+  bwipe!
+endfunc
+
 func Test_recording_status_in_ex_line()
   norm qx
   redraw!
diff --git a/test/functional/provider/clipboard_spec.lua b/test/functional/provider/clipboard_spec.lua
index 986db96a18..5bdfec574e 100644
--- a/test/functional/provider/clipboard_spec.lua
+++ b/test/functional/provider/clipboard_spec.lua
@@ -50,29 +50,33 @@ local function basic_register_test(noblock)
     text, stuff and some more
     some some text, stuff and some more]])
 
-  -- deleting a word to named ("a) updates "1 (and not "-)
+  -- deleting a word to named ("a) doesn't update "1 or "-
   feed('gg"adwj"1P^"-P')
   expect([[
     , stuff and some more
-    some textsome some text, stuff and some more]])
+    some some random text
+    some some text, stuff and some more]])
 
   -- deleting a line does update ""
   feed('ggdd""P')
   expect([[
     , stuff and some more
-    some textsome some text, stuff and some more]])
+    some some random text
+    some some text, stuff and some more]])
 
   feed('ggw<c-v>jwyggP')
   if noblock then
     expect([[
       stuf
-      me t
+      me s
       , stuff and some more
-      some textsome some text, stuff and some more]])
+      some some random text
+      some some text, stuff and some more]])
   else
     expect([[
       stuf, stuff and some more
-      me tsome textsome some text, stuff and some more]])
+      me ssome some random text
+      some some text, stuff and some more]])
   end
 
   -- pasting in visual does unnamed delete of visual selection