Delete, Backspace, Enter, Page, Arrow and other navigation key actions occur in the document window when focus is the Infobar.

To repro:

Start Writer so the Infobar is displayed.
To do this the following steps work for me:
  i) soffice.bin --safe-mode
  ii) select Reset to factory settings radio button and check the two check boxes that become available; Reset settings and user interface modifications and Reset entire user profile and Apply Changes and Restart.
  iii) close and do soffice.bin --safe-mode again
  iv) select Continue in safe mode
When Writer starts the Infobar should be visible and show a message like "You are running version x.x of LibreOffice for the first time. Do you want to learn what's new? followed by a Release Notes button and an X close button.

1) Open a document or enter some text - "This is a Test"
2) Position the cursor around the middle of a sentence.
3) Press F6 until focus is lost in the Infobar. This requires three presses of F6 if standard toolbar and formatting toolbar are open.
4) Press Delete, Backspace, Enter and various navigation keys.

Results: Key action happens in the document window.

Expected results: Key action doesn't happen in document window.