void uninstall() {
			mouseUpdateTimer.stop();
			mouseUpdateTimer = null;

			timeoutTimer.stop();
			timeoutTimer = null;

			lastMouseEvent = null;

			super.pop();
		}
Improves usability of submenus by using a
<a href="https://height.app/blog/guide-to-build-context-menus#safe-triangle">safe triangle</a>
to avoid that the submenu closes while the user moves the mouse to it.

@author Karl Tauber
flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java