- Button:

- In "Flat Light" theme, changed styles of focused and default buttons to
    avoid confusion with all other themes. Focused buttons now have a white
    background (was light blue) and a slightly wider border. The default button
    now has a light blue background (was white) and a thin border. In all other
    themes the default button also has colored background.
  - In "Flat Dark" theme, use slightly wider border for focused buttons.
- CheckBox and RadioButton: In "Flat Dark" theme, use blueish background for
  focused components.

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/FlatTestLaf.properties

@@ -149,6 +149,7 @@ DesktopIcon.background = darken($Desktop.background,20%)
 
 #---- HelpButton ----
 
+HelpButton.focusedBackground = #0ff
 HelpButton.questionMarkColor = #00f