IllegalComponentStateException when invoker is not showing in SubMenuUsabilityHelper

[rkeen-siemens]

Sometimes when opening a submenu immediately after first opening the application we are getting an exception within SubMenuUsabilityHelper:

java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
	at java.desktop/java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:2113)
	at java.desktop/java.awt.Component.getLocationOnScreen(Component.java:2087)
	at com.formdev.flatlaf.SubMenuUsabilityHelper.menuSelectionChanged(SubMenuUsabilityHelper.java:157)
	at com.formdev.flatlaf.SubMenuUsabilityHelper.lambda$stateChanged$0(SubMenuUsabilityHelper.java:119)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:771)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:741)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
[catch] at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

When this happens, invoker.isShowing() is false. This may be happening because we have a dynamic popup menu that populates itself. The first call in the update is to JMenu.removeAll() which may cause it to be hidden.

In any case, adding a check for invoker.isShowing() in the conditional when getting the invoker screen bounds could avoid this issue.

[DevCharly]

Thanks for reporting 👍

fixed in latest 3.2-SNAPSHOT: https://github.com/JFormDesigner/FlatLaf#snapshots