[keyboard] If keyboard is open, only half screen is used for app in landscape mode

Reported onManjaro Gitlab.

I can reproduce this with images all the way back from Beta 3 (updated to current stable branch) up to at least yesterdays dev image.

Simple to reproduce.

• Be in portrait orientation.
• Open any app that has a text input field.
• Mark the text input field in the app to get the keyboard to show.
• Turn phone to landscape orientation.

Gets fixed when rotating back to portrait orientation.