3 files changed, 59 insertions, 2 deletions
diff --git a/test/functional/editor/K_spec.lua b/test/functional/editor/K_spec.lua
index 8ad81ac3d6..3b5580540f 100644
--- a/test/functional/editor/K_spec.lua
+++ b/test/functional/editor/K_spec.lua
@@ -1,6 +1,6 @@
 local helpers = require('test.functional.helpers')(after_each)
-local eq, clear, eval, feed, retry =
-  helpers.eq, helpers.clear, helpers.eval, helpers.feed, helpers.retry
+local eq, clear, eval, feed, meths, retry =
+  helpers.eq, helpers.clear, helpers.eval, helpers.feed, helpers.meths, helpers.retry
 
 describe('K', function()
   local test_file = 'K_spec_out'
@@ -58,4 +58,11 @@ describe('K', function()
     helpers.neq(bufnr, eval('bufnr()'))
   end)
 
+  it('empty string falls back to :help #19298', function()
+    meths.set_option('keywordprg', '')
+    meths.buf_set_lines(0, 0, -1, true, {'doesnotexist'})
+    feed('K')
+    eq('E149: Sorry, no help for doesnotexist', meths.get_vvar('errmsg'))
+  end)
+
 end)
diff --git a/test/functional/editor/mode_insert_spec.lua b/test/functional/editor/mode_insert_spec.lua
index e3d3cdbd85..cd51a65be3 100644
--- a/test/functional/editor/mode_insert_spec.lua
+++ b/test/functional/editor/mode_insert_spec.lua
@@ -6,12 +6,20 @@ local expect = helpers.expect
 local command = helpers.command
 local eq = helpers.eq
 local eval = helpers.eval
+local curbuf_contents = helpers.curbuf_contents
 
 describe('insert-mode', function()
   before_each(function()
     clear()
   end)
 
+  it('indents only once after "!" keys #12894', function()
+    command('let counter = []')
+    command('set indentexpr=len(add(counter,0))')
+    feed('i<C-F>x')
+    eq(' x', curbuf_contents())
+  end)
+
   it('CTRL-@', function()
     -- Inserts last-inserted text, leaves insert-mode.
     insert('hello')
diff --git a/test/functional/editor/tabpage_spec.lua b/test/functional/editor/tabpage_spec.lua
index 849a02c28b..f8ca6986bd 100644
--- a/test/functional/editor/tabpage_spec.lua
+++ b/test/functional/editor/tabpage_spec.lua
@@ -9,6 +9,9 @@ local feed = helpers.feed
 local eval = helpers.eval
 local exec = helpers.exec
 local funcs = helpers.funcs
+local meths = helpers.meths
+local curwin = helpers.curwin
+local assert_alive = helpers.assert_alive
 
 describe('tabpage', function()
   before_each(clear)
@@ -54,6 +57,45 @@ describe('tabpage', function()
     neq(999, eval('g:win_closed'))
   end)
 
+  it('no segfault with strange WinClosed autocommand #20290', function()
+    pcall(exec, [[
+      set nohidden
+      edit Xa
+      split Xb
+      tab split
+      new
+      autocmd WinClosed * tabprev | bwipe!
+      close
+    ]])
+    assert_alive()
+  end)
+
+  it('nvim_win_close and nvim_win_hide update tabline #20285', function()
+    eq(1, #meths.list_tabpages())
+    eq({1, 1}, funcs.win_screenpos(0))
+    local win1 = curwin().id
+
+    command('tabnew')
+    eq(2, #meths.list_tabpages())
+    eq({2, 1}, funcs.win_screenpos(0))
+    local win2 = curwin().id
+
+    meths.win_close(win1, true)
+    eq(win2, curwin().id)
+    eq(1, #meths.list_tabpages())
+    eq({1, 1}, funcs.win_screenpos(0))
+
+    command('tabnew')
+    eq(2, #meths.list_tabpages())
+    eq({2, 1}, funcs.win_screenpos(0))
+    local win3 = curwin().id
+
+    meths.win_hide(win2)
+    eq(win3, curwin().id)
+    eq(1, #meths.list_tabpages())
+    eq({1, 1}, funcs.win_screenpos(0))
+  end)
+
   it('switching tabpage after setting laststatus=3 #19591', function()
     local screen = Screen.new(40, 8)
     screen:set_default_attr_ids({