Description of problem:
Steps to Reproduce:
1.Install ibus-gtk4 and gtk4-devel packages.
2.Enable an input method engine
4.Select "Entry" -> "Completion" in the left pane
5.Click "Run" button in the top
6.Focus on the input entry and type a language string.
7.Try to press backspace.
Backspace key does not working
Backspace key should work
It seems related to the ibus-gtk4 immodule.
At least if I disable all IMEs or remove ibus-gtk4
then gtk4 input works normally again.
(I used Text View -> Multiple Views to avoid any other input completion feature.)
Probably this will be a limitation until the solution is found.
After the upstream discussion, I enable a sync key process key events.
Other issues should be reported separatedly.