vim-patch:9.0.0190: the way 'cmdheight' can be made zero is inconsistent

Problem:    The way 'cmdheight' can be made zero is inconsistent.
Solution:   Only make 'cmdheight' zero when setting it explicitly, not when
            resizing windows. (closes vim/vim#10890)
https://github.com/vim/vim/commit/f797e309caff48f7a56c73b16e62ff67c4dcbdd6

1 files changed, 29 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_cmdline.vim b/src/nvim/testdir/test_cmdline.vim
index b9eefa937a..cac1491d63 100644
--- a/src/nvim/testdir/test_cmdline.vim
+++ b/src/nvim/testdir/test_cmdline.vim
@@ -126,6 +126,35 @@ func Test_wildmenu_screendump()
   call delete('XTest_wildmenu')
 endfunc
 
+func Test_changing_cmdheight()
+  CheckScreendump
+
+  let lines =<< trim END
+      set cmdheight=1 laststatus=2
+  END
+  call writefile(lines, 'XTest_cmdheight')
+
+  let buf = RunVimInTerminal('-S XTest_cmdheight', {'rows': 8})
+  call term_sendkeys(buf, ":resize -3\<CR>")
+  call VerifyScreenDump(buf, 'Test_changing_cmdheight_1', {})
+
+  " using the space available doesn't change the status line
+  call term_sendkeys(buf, ":set cmdheight+=3\<CR>")
+  call VerifyScreenDump(buf, 'Test_changing_cmdheight_2', {})
+
+  " using more space moves the status line up
+  call term_sendkeys(buf, ":set cmdheight+=1\<CR>")
+  call VerifyScreenDump(buf, 'Test_changing_cmdheight_3', {})
+
+  " reducing cmdheight moves status line down
+  call term_sendkeys(buf, ":set cmdheight-=2\<CR>")
+  call VerifyScreenDump(buf, 'Test_changing_cmdheight_4', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('XTest_cmdheight')
+endfunc
+
 func Test_map_completion()
   if !has('cmdline_compl')
     return