patch 9.1.1391: Vim does not have a vertical tabpanel

Problem:  Vim does not have a tabpanel
Solution: include the tabpanel feature
          (Naruhiko Nishino, thinca)

closes: #17263

Co-authored-by: thinca <thinca@gmail.com>
Signed-off-by: Naruhiko Nishino <naru123456789@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/change.c b/src/change.c
index c48d254..438bbda 100644
--- a/src/change.c
+++ b/src/change.c
@@ -142,6 +142,9 @@
     ml_setflags(curbuf);
     check_status(curbuf);
     redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+    redraw_tabpanel = TRUE;
+#endif
     need_maketitle = TRUE;	    // set window title later
 }
 
@@ -917,6 +920,9 @@
 	    save_file_ff(buf);
 	check_status(buf);
 	redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+	redraw_tabpanel = TRUE;
+#endif
 	need_maketitle = TRUE;	    // set window title later
 	++CHANGEDTICK(buf);
     }