vim-patch:8.2.4346: a custom statusline may cause Esc to work like Enter

Problem:    A custom statusline may cause Esc to work like Enter on the
            command line when the popup menu is displayed.
Solution:   Save and restore KeyTyped. (closes vim/vim#9749)

481acb1141

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/statusline.c

@@ -639,6 +639,7 @@ int fillchar_status(int *attr, win_T *wp)
 void redraw_custom_statusline(win_T *wp)
 {
   static bool entered = false;
+  bool saved_KeyTyped = KeyTyped;
 
   // When called recursively return.  This can happen when the statusline
   // contains an expression that triggers a redraw.
@@ -649,6 +650,9 @@ void redraw_custom_statusline(win_T *wp)
 
   win_redr_custom(wp, false, false);
   entered = false;
+
+  // A user function may reset KeyTyped, restore it.
+  KeyTyped = saved_KeyTyped;
 }
 
 static void ui_ext_tabline_update(void)

src/nvim/testdir/test_cmdline.vim

@@ -2304,6 +2304,14 @@ func Test_wildmenu_pum()
       return repeat(['aaaa'], 120)
     endfunc
     command -nargs=* -complete=customlist,CmdCompl Tcmd
+
+    func MyStatusLine() abort
+      return 'status'
+    endfunc
+    func SetupStatusline()
+      set statusline=%!MyStatusLine()
+      set laststatus=2
+    endfunc
   [CODE]
   call writefile(commands, 'Xtest')
 
@@ -2487,6 +2495,13 @@ func Test_wildmenu_pum()
   call term_sendkeys(buf, ":ls\<CR>")
   call term_sendkeys(buf, ":com\<Tab> ")
   call VerifyScreenDump(buf, 'Test_wildmenu_pum_38', {})
+  call term_sendkeys(buf, "\<C-U>\<CR>")
+
+  " Esc still works to abort the command when 'statusline' is set
+  call term_sendkeys(buf, ":call SetupStatusline()\<CR>")
+  call term_sendkeys(buf, ":si\<Tab>")
+  call term_sendkeys(buf, "\<Esc>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_pum_39', {})
 
   call term_sendkeys(buf, "\<C-U>\<CR>")
   call StopVimInTerminal(buf)