private static boolean isMacOSBorderSupported() {
		return SystemInfo.isMacOS &&
			FlatSystemProperties.getBoolean( FlatSystemProperties.USE_ROUNDED_POPUP_BORDER, true ) &&
			FlatNativeMacLibrary.isLoaded();
	}
Checks whether the owner component returns a tooltip location in
JComponent.getToolTipLocation(MouseEvent).
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupFactory.java