vim-patch:8.2.1580: wildmenu does not work properly

Problem:    Wildmenu does not work properly.
Solution:   Do not call may_do_incsearch_highlighting() if completion is in
            progress.
https://github.com/vim/vim/commit/a60053b8f4cc7e135ba9496a8f4855d26aee09e7

2 files changed, 30 insertions, 1 deletions

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index 5868e3660f..0bc52f1e97 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -2255,7 +2255,9 @@ static int command_line_changed(CommandLineState *s)
     close_preview_windows();
     update_screen(SOME_VALID);  // Clear 'inccommand' preview.
   } else {
-    may_do_incsearch_highlighting(s->firstc, s->count, &s->is_state);
+    if (s->xpc.xp_context == EXPAND_NOTHING) {
+      may_do_incsearch_highlighting(s->firstc, s->count, &s->is_state);
+    }
   }
 
   if (cmdmsg_rl || (p_arshape && !p_tbidi)) {
diff --git a/src/nvim/testdir/test_cmdline.vim b/src/nvim/testdir/test_cmdline.vim
index e9f529d217..bb0cae4819 100644
--- a/src/nvim/testdir/test_cmdline.vim
+++ b/src/nvim/testdir/test_cmdline.vim
@@ -75,6 +75,33 @@ func Test_complete_wildmenu()
   set nowildmenu
 endfunc
 
+func Test_wildmenu_screendump()
+  CheckScreendump
+
+  let lines =<< trim [SCRIPT]
+    set wildmenu hlsearch
+  [SCRIPT]
+  call writefile(lines, 'XTest_wildmenu')
+
+  let buf = RunVimInTerminal('-S XTest_wildmenu', {'rows': 8})
+  call term_sendkeys(buf, ":vim\<Tab>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_1', {})
+
+  call term_sendkeys(buf, "\<Tab>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_2', {})
+
+  call term_sendkeys(buf, "\<Tab>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_3', {})
+
+  call term_sendkeys(buf, "\<Tab>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_4', {})
+  call term_sendkeys(buf, "\<Esc>")
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('XTest_wildmenu')
+endfunc
+
 func Test_map_completion()
   if !has('cmdline_compl')
     return