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>

src/ex_cmds.c

@@ -1854,6 +1854,9 @@ ex_file(exarg_T *eap)
 	if (rename_buffer(eap->arg) == FAIL)
 	    return;
 	redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+	redraw_tabpanel = TRUE;
+#endif
     }
 
     // print file name if no argument or 'F' is not in 'shortmess'
@@ -2100,6 +2103,9 @@ do_write(exarg_T *eap)
 	    {
 		curbuf->b_p_ro = FALSE;
 		redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+		redraw_tabpanel = TRUE;
+#endif
 	    }
 	}