Test Size buttons stay focused after click, can't unclick

[andradei]

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Image above: Text Size +</Kbd> button is focused and will not lose focus.

Once the +</Kbd> or -</Kbd> button for Text Size is clicked, they stay focused until window is closed.

This becomes a usability issue on this scenario:

1. Click on one of those buttons
2. Use the text tool, create a text area, start typing
3. Every time Space is pressed the focused button from item 1 gets activated and the text size value is changes

The buttons for Link Width work as expected, though, I point this out because it can point to solution.