When tabbing between the settings on any UI, buttons get selected and sometimes display tooltips. But after clicking other buttons, the previous selected is still highlighted.

One would expect that if a button is highlighted with TAB, it would stop focus after clicking either the background or other buttons/sliders within the menu. However this doesn't seem to be the case, and also makes it possible to highlight multiple buttons, which doesn't make sense.

This is what happens after selecting a button with tab, then clicking another button further down and tabbing again:

How to reproduce

1. Go to any UI menu, like video settings.
2. Tab around and select a button.
3. Now click the background or another button/slider.

Expected result
Buttons would no longer be highlighted after clicking the background or other buttons, thus making it not possible to select multiple buttons.

Observed result
Buttons still remain selected even after clicking other elements, making other buttons to be selected as well.