static boolean isHelpButton( Component c ) {
		return c instanceof JButton && BUTTON_TYPE_HELP.equals( getButtonTypeStr( (JButton) c ) );
	}
Returns true if the button has an icon but no text,
or it does not have an icon and the text is either "..." or one character.
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonUI.java