patch 9.2.0238: showmode message may not be displayed

Problem:  showmode message may not be displayed (Yee Cheng Chin)
Solution: Don't call char_avail() in skip_showmode(), but check
          for anything in the stuff and typeahead buffer
          (Hirohito Higashi).

Fix "-- VISUAL --" not shown when terminal responses are pending

When starting Vim with a script that enters Visual mode (e.g.
"vim -S script.vim"), the "-- VISUAL --" mode message sometimes
doesn't appear. This happens because skip_showmode() calls
char_avail(), which reads raw terminal input and picks up terminal
response escape sequences (e.g. t_RV response). Combined with
!KeyTyped (which is TRUE after script execution), this causes
skip_showmode() to return TRUE, preventing the mode from being
displayed.

Fix this by checking only the stuff buffer and typeahead buffer for
pending characters, instead of char_avail() which also reads raw
terminal input. This way, terminal response sequences no longer
interfere with mode display.

fixes:  #16620
closes: #19801

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/screen.c

@@ -4417,17 +4417,20 @@ screen_del_lines(
 
 /*
  * Return TRUE when postponing displaying the mode message: when not redrawing
- * or inside a mapping.
+ * or inside a mapping or a script.
  */
     int
 skip_showmode(void)
 {
-    // Call char_avail() only when we are going to show something, because it
-    // takes a bit of time.  redrawing() may also call char_avail().
+    // Check the stuff buffer, typeahead buffer and script input for pending
+    // characters, instead of char_avail() which also reads raw terminal input
+    // and may pick up terminal response sequences (e.g. t_RV response),
+    // falsely preventing the mode from being shown.
     if (global_busy
 	    || msg_silent != 0
 	    || !redrawing()
-	    || (char_avail() && !KeyTyped))
+	    || ((!stuff_empty() || typebuf.tb_len > 0 || using_script())
+		&& !KeyTyped))
     {
 	redraw_mode = TRUE;		// show mode later
 	return TRUE;

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    238,
 /**/
     237,
 /**/