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/misc2.c b/src/misc2.c
index 909812c..7912577 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -1879,6 +1879,9 @@
     // This may cause the buffer to become (un)modified.
     check_status(curbuf);
     redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+    redraw_tabpanel = TRUE;
+#endif
     need_maketitle = TRUE;	    // set window title later
 }