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1. Initiate a drag with the 'Package Explorer'. 2. Move the mouse around. 3. Hit 'Esc' to cancel the DND operation. 4. Its content goes blank. Clicking back on the tab will bring the content back. The tool bar does not return though. Workaround is to close all the tabs in that stack and then bring them back. java.lang.IllegalArgumentException: Argument not valid at org.eclipse.swt.SWT.error(SWT.java:4258) at org.eclipse.swt.SWT.error(SWT.java:4192) at org.eclipse.swt.SWT.error(SWT.java:4163) at org.eclipse.e4.ui.widgets.CTabFolder.removeTabControl(CTabFolder.java:3711) at org.eclipse.e4.ui.widgets.CTabFolder.setTopRight(CTabFolder.java:3283) at org.eclipse.e4.ui.widgets.CTabFolder.setTopRight(CTabFolder.java:3248) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.showElementRecursive(LazyStackRenderer.java:235) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.showTab(LazyStackRenderer.java:139) at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:545) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:68) at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:41) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:179) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4681) at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:182) at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38) at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1) at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230) at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148) at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135) at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78) at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39) at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:81) at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:380) at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:171) at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.showElementInWindow(ModelServiceImpl.java:305) at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.bringToTop(ModelServiceImpl.java:260) at org.eclipse.e4.ui.workbench.addons.dndaddon.DragAgent.cancelDrag(DragAgent.java:104) at org.eclipse.e4.ui.workbench.addons.dndaddon.DnDManager.finishDrag(DnDManager.java:259) at org.eclipse.e4.ui.workbench.addons.dndaddon.DnDManager.startDrag(DnDManager.java:233) at org.eclipse.e4.ui.workbench.addons.dndaddon.DnDManager$3.handleEvent(DnDManager.java:110) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4163) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3752)
Created attachment 193752 [details] LazyStackRenderer patch v1 ToolBar controls were reparented to the limbo shell when they were removed from the model but not reparented back when they were back in the model.
(In reply to comment #1) > Created attachment 193752 [details] > LazyStackRenderer patch v1 Patch released to CVS HEAD. I made a slight change to the tests so that they'd actually assert instead of waiting for logging statements.
