- 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-theme-editor/src/main/resources/com/formdev/flatlaf/themeeditor/FlatLafUIKeys.txt

@@ -39,6 +39,7 @@ Button.highlight
 Button.hoverBackground
 Button.hoverBorderColor
 Button.iconTextGap
+Button.innerFocusWidth
 Button.light
 Button.margin
 Button.minimumWidth
@@ -236,6 +237,7 @@ FormattedTextFieldUI
 HeaderUI
 HelpButton.background
 HelpButton.borderColor
+HelpButton.borderWidth
 HelpButton.disabledBackground
 HelpButton.disabledBorderColor
 HelpButton.disabledQuestionMarkColor
@@ -244,6 +246,7 @@ HelpButton.focusedBorderColor
 HelpButton.hoverBackground
 HelpButton.hoverBorderColor
 HelpButton.icon
+HelpButton.innerFocusWidth
 HelpButton.pressedBackground
 HelpButton.questionMarkColor
 Hyperlink.disabledText