patch 9.2.0468: popups: not correctly updated from a CmdlineChanged autocommand

Problem:  popup_show() from a CmdlineChanged autocommand doesn't update
          the screen (Mao-Yining)
Solution: Refresh the screen when popups need redraw
          (Yasuhiro Matsumoto).

popup_settext()/popup_show() called from a CmdlineChanged autocommand
did not refresh the screen because cmdline mode normally skips
update_screen(), so async info-popup updates only became visible after
a manual :redraw.  Refresh the screen when popups need redrawing right
after the autocommand.

fixes:  #20175
closes: #20179

Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/ex_getln.c

@@ -2696,7 +2696,17 @@ cmdline_changed:
 		&& (ccline.cmdpos != prev_cmdpos
 		    || (prev_cmdbuff != NULL &&
 			STRCMP(prev_cmdbuff, ccline.cmdbuff) != 0)))
+	{
 	    trigger_cmd_autocmd(cmdline_type, EVENT_CMDLINECHANGED);
+#ifdef FEAT_PROP_POPUP
+	    // Show popup updates from the autocmd without a manual :redraw.
+	    if (popup_need_redraw())
+	    {
+		update_screen(0);
+		redrawcmd();
+	    }
+#endif
+	}
 
 	// Trigger CursorMovedC autocommands.
 	if (ccline.cmdpos != prev_cmdpos)

src/testdir/dumps/Test_wildmenu_pum_info_async_update.dump

@@ -0,0 +1,14 @@
+| +0&#ffffff0@49
+|~+0#4040ff13&| @48
+|~| @48
+|~| @48
+|~| @48
+|~| @48
+|~| @48
+|~| @48
+|~| @48
+|~| @48
+|~| @19|╔+0#0000001#e0e0e08|═@5|X| +0#4040ff13#ffffff0@20
+|~| @3| +0#0000001#e0e0e08|1| @13|║| |d|o|n|e| |║| +0#4040ff13#ffffff0@20
+|~| @3| +0#0000001#ffd7ff255|2| @13|╚+0&#e0e0e08|═@5|⇲| +0#4040ff13#ffffff0@20
+|:+0#0000000&|T|e|s|t| |1> @42

src/testdir/test_cmdline.vim

@@ -3190,6 +3190,48 @@ func Test_wildmenu_pum()
   call StopVimInTerminal(buf)
 endfunc
 
+" Test that popup_settext() from a CmdlineChanged autocmd updates the
+" cmdline-mode info popup without needing an explicit :redraw (#20175).
+func Test_wildmenu_pum_info_async_update()
+  CheckScreendump
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      vim9script
+      set completeopt=menuone,popup
+      set wildmenu wildoptions=pum wildcharm=<Tab>
+      augroup Test
+          au!
+          au CmdlineChanged : UpdateInfo()
+      augroup END
+
+      def UpdateInfo()
+          if getcmdcompltype() != 'customlist,Complete'
+              return
+          endif
+          var id = popup_findinfo()
+          if id != 0
+              id->popup_settext('done')
+              popup_show(id)
+          endif
+      enddef
+
+      def Complete(_, _, _): list<dict<any>>
+          return [{word: '1', info: 'lazy'}, {word: '2', info: 'lazy'}]
+      enddef
+
+      command! -nargs=1 -complete=customlist,Complete Test echo <args>
+  END
+  call writefile(lines, 'XtestWildmenuInfoAsync', 'D')
+  let buf = RunVimInTerminal('-S XtestWildmenuInfoAsync', #{rows: 14, cols: 50})
+  call term_sendkeys(buf, ":Test \<Tab>")
+  call TermWait(buf, 200)
+  call VerifyScreenDump(buf, 'Test_wildmenu_pum_info_async_update', {})
+
+  call term_sendkeys(buf, "\<Esc>")
+  call StopVimInTerminal(buf)
+endfunc
+
 " Test for wildmenumode() with the cmdline popup menu
 func Test_wildmenumode_with_pum()
   set wildmenu

src/version.c

@@ -729,6 +729,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    468,
 /**/
     467,
 /**/