fix(ui2): ensure msg window is visible after closing tab
Problem: After closing a tabpage while the msg window is showing a
message, it is hidden while the msg window still contains a
message.
Solution: Unhide the msg window after entering a tabpage and it still
contains a message.
(cherry picked from commit 607fcfb37a)
Co-authored-by: Luuk van Baal <luukvbaal@gmail.com>
Co-authored-by: Linykq <yukunlin590@gmail.com>
b6a3ad3979