PageDown / Up stops working in gallery, chat list, contact list (reacti-window)

[WofWca]

See #4269 (comment)

As I said in #4269 (comment), maybe a solution would be to add explicit PageUp / PageDown shortcuts in such places.
But maybe arrow keys are enough anyway, perhaps it's not that important.

• Operating System (Linux/Mac/Windows/iOS/Android):

• Delta Chat Version: 05ee7d5

• Expected behavior:
  Page Up / PageDown always works

• Actual behavior:
  Page Up / PageDown doesn't work after a bit of scrolling

• Steps to reproduce the problem:

  1. Open gallery (you must have a lot of items there)
  2. Focus an element in gallery using keyboard
  3. Press Page Down 2 times to scroll down

• Screenshots:

  2024-11-01-IInMg1Z9Y3.mp4

• Logs:

This is happening because the element gets unrendered (thanks to react-window), and loses focus.