Tab navigation doesn't respect removed panels by the user

[Inkrementator]

Overview

Using tab to switch focus between elements of the GUI doesn't work as expected if I remove the database tags pane. Pressing in the group pane moves focus somewhere I can't see, presumable the now invisible database tags pane. Similarly, pressing <Shift+Tab> in the Database-Entry List also moves focus off-screen.

Steps to Reproduce

1. Click on one of the database groups to move focus there
2. Press to verify that focus is moved to database pane, pressing tab again moves to database entries.
3. Remove database tags pane by dragging the upper border of it as far down as possible.
4. Click on one of the database groups to move focus there
5. Press once. Now it is not visible, where the focus is.
6. Press again to move to database entries.

Expected Behavior

Pressing tab once from database group pane while database tags pane is removed should move focus directly to database entries. Step 5. should not happen.

Actual Behavior

Pressing tab once from database group pane moves focus to invisible location, presumably to the nonexistant database tags. Pressing again allows to go to database entries.

Context

KeePassXC - Version 2.7.1
Revision: 5916a8f

Operating System: Linux
Desktop Env: i3
Windowing System: X11

[droidmonkey]

I have fixed this for 2.7.2, will be in upcoming PR