patch 9.2.0169: assertion failure in syn_id2attr()

Problem:  assertion failure in syn_id2attr()
          (@julio-b, after v9.2.0093)
Solution: Set tp_curwin to a valid window in popup_close_tabpage()
          and return early in update_winhighlight() if there are
          no highlight overrides to update (Foxe Chen).

fixes:  #19650
closes: #19670

Signed-off-by: Foxe Chen <chen.foxe@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/highlight.c

@@ -5758,6 +5758,9 @@ update_winhighlight(win_T *wp, char_u *opt)
     if (arr == NULL && err != NULL)
 	return err;
 
+    if (arr == NULL && wp->w_hl == NULL)
+	return NULL;
+
     update_highlight_overrides(wp->w_hl, arr, num);
 
     vim_free(wp->w_hl);

src/popupwin.c

@@ -3283,6 +3283,12 @@ popup_close_tabpage(tabpage_T *tp, int id, int force)
 		}
 		back_to_prevwin(wp);
 	    }
+
+	    // Set curwin for tabpage to a valid window, in case we try
+	    // accessing it later.
+	    if (tp->tp_curwin == wp)
+		tp->tp_curwin = tp->tp_firstwin;
+
 	    if (prev == NULL)
 		*root = wp->w_next;
 	    else

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    169,
 /**/
     168,
 /**/