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/ex_cmds.h b/src/ex_cmds.h
index 0659f87..fb8d62f 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1292,6 +1292,9 @@
 EXCMD(CMD_redrawtabline, "redrawtabline", ex_redrawtabline,
 	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
+EXCMD(CMD_redrawtabpanel, "redrawtabpanel", ex_redrawtabpanel,
+	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
+	ADDR_NONE),
 EXCMD(CMD_registers,	"registers",	ex_display,
 	EX_EXTRA|EX_NOTRLCOM|EX_TRLBAR|EX_SBOXOK|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),