fix(ui): problems with handling ui_attach side effects #28522
Merged
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fix(ui): update ext_ui widgets when attaching non-remote UI
Problem: Updating internalized UI capabilities is postponed until a
remote UI attaches.
Solution: Always update active UI widgets in ui_refresh().
fix(ui): set 'cmdheight' to zero for all open tabpages
Problem: Enabling ext_messages claims to set 'cmdheight' to zero, but
only does so for the current tabpage.
Solution: Set stored 'cmdheight' value to zero for all tabpages.
Fix #28526