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A tab from view can be dragged into the fast view area to be changed into a fast view. Before M2, it was possible to drag the fast view icon back to a tab group to turn the fast view back into a normal view. In M2, this doesn't happen: the cursor doesn't change to indicate that the view has been "picked up", and some weird view-like artifacts appear (see attached screenshot). The "Fast View" checkbox on the icon's context menu still works, however.
Created attachment 27902 [details] Screenshot
Aha. And here's the stack trace from the error log: java.lang.NullPointerException at org.eclipse.ui.internal.PartSashContainer.drag(PartSashContainer.java:1034) at org.eclipse.ui.internal.dnd.DragUtil.getDropTarget(DragUtil.java:338) at org.eclipse.ui.internal.dnd.DragUtil.getDropTarget(DragUtil.java:361) at org.eclipse.ui.internal.dnd.DragUtil$2.run(DragUtil.java:217) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:152) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:28) at org.eclipse.swt.widgets.Display.syncExec(Display.java:3527) at org.eclipse.ui.internal.dnd.DragUtil$1.handleEvent(DragUtil.java:211) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:884) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:908) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:893) at org.eclipse.swt.widgets.Tracker.wmMouse(Tracker.java:1030) at org.eclipse.swt.widgets.Tracker.open(Tracker.java:509) at org.eclipse.ui.internal.dnd.DragUtil.dragToTarget(DragUtil.java:292) at org.eclipse.ui.internal.dnd.DragUtil.performDrag(DragUtil.java:124) at org.eclipse.ui.internal.FastViewBar.startDrag(FastViewBar.java:551) at org.eclipse.ui.internal.FastViewBar.startDraggingFastView(FastViewBar.java:527) at org.eclipse.ui.internal.FastViewBar$1.handleEvent(FastViewBar.java:106) at org.eclipse.ui.presentations.PresentationUtil.handleMouseMove(PresentationUtil.java:96) at org.eclipse.ui.presentations.PresentationUtil.access$4(PresentationUtil.java:89) at org.eclipse.ui.presentations.PresentationUtil$2.handleEvent(PresentationUtil.java:61) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:884) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3194) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2823) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1755) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1719) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:368) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:106) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:377) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:164) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:338) at org.eclipse.core.launcher.Main.basicRun(Main.java:282) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952)
*** This bug has been marked as a duplicate of 110354 ***
