When user starts dragging a window component in NetBeans the AWT thread stays blocked with this stacktrace:

"AWT-EventQueue-0" prio=5 tid=0x00007fa204b09000 nid=0x16794b000 runnable [0x0000000167948000]
   java.lang.Thread.State: RUNNABLE
at sun.lwawt.macosx.CWrapper$NSScreen.visibleFrame(Native Method)
at sun.lwawt.macosx.LWCToolkit.getScreenInsets(LWCToolkit.java:355)
at java.awt.Window.init(Window.java:497)
at java.awt.Window.<init>(Window.java:535)
at java.awt.Frame.<init>(Frame.java:420)
at java.awt.Frame.<init>(Frame.java:385)
at javax.swing.SwingUtilities$SharedOwnerFrame.<init>(SwingUtilities.java:1756)
at javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1831)
at javax.swing.JWindow.<init>(JWindow.java:185)
at javax.swing.JWindow.<init>(JWindow.java:137)
at org.netbeans.core.windows.view.dnd.DragWindow.<init>(DragWindow.java:85)
at org.netbeans.core.windows.view.dnd.DragAndDropFeedbackVisualizer.createDragWindow(DragAndDropFeedbackVisualizer.java:101)
at org.netbeans.core.windows.view.dnd.DragAndDropFeedbackVisualizer.start(DragAndDropFeedbackVisualizer.java:132)
at org.netbeans.core.windows.view.dnd.TopComponentDragSupport.doStartDrag(TopComponentDragSupport.java:428)
at org.netbeans.core.windows.view.dnd.TopComponentDragSupport.eventDispatched(TopComponentDragSupport.java:353)
at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2430)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2321)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2321)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2321)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2321)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2321)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2321)
at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2280)
at java.awt.Component.dispatchEventImpl(Component.java:4757)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4509)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2713)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:703)
at java.awt.EventQueue.access$000(EventQueue.java:102)
at java.awt.EventQueue$3.run(EventQueue.java:662)
at java.awt.EventQueue$3.run(EventQueue.java:660)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:676)
at java.awt.EventQueue$4.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:673)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

Related NetBeans issue:
https://www.netbeans.org/bugzilla/show_bug.cgi?id=208513

Please evaluate under what conditions method Wrapper$NSScreen.visibleFrame() can block and if this should be fixed on Java side.

Thanks!