Bug 320243 Closing last view of a minimized stack makes the stack in an unstable state
I20100718-2237 1. Minimize the 'Package Explorer'. 2. Show it by clicking its icon in the trim. 3. Close it. 4. Notice that it still shows up in the trim. 5. Click on the icon. 6. An SWTException occurs. org.eclipse.swt.SWTException: Widget is disposed at org.eclipse.swt.SWT.error(SWT.java:4083) at org.eclipse.swt.SWT.error(SWT.java:3998) at org.eclipse.swt.SWT.error(SWT.java:3969) at org.eclipse.swt.widgets.Widget.error(Widget.java:468) at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340) at org.eclipse.swt.widgets.Widget.getData(Widget.java:554) at org.eclipse.e4.ui.workbench.addons.minmax.TrimStack$9.widgetSelected(TrimStack.java:308)
bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/minmax/MinMaxAddon.java
folder.addMouseListener(new MouseListener() {
						public void mouseUp(MouseEvent e) {
						}
						public void mouseDown(MouseEvent e) {
						}
						public void mouseDoubleClick(MouseEvent e) {
							MWindow window = modelService.getTopLevelWindowFor(changedElement);
							MPerspective curPersp = modelService.getActivePerspective(window);
							if (curPersp.getTags().contains(EA_MAXIMIZED))
								curPersp.getTags().remove(EA_MAXIMIZED);
							else
								curPersp.getTags().add(EA_MAXIMIZED);
						}
					});
				}
			}
		}
	};
	private EventHandler perspectiveChangeListener = new EventHandler() {
		public void handleEvent(Event event) {
			final MUIElement changedElement = (MUIElement) event.getProperty(EventTags.ELEMENT);
			if (!(changedElement instanceof MPerspectiveStack))
				return;
			MPerspectiveStack ps = (MPerspectiveStack) changedElement;
			final MPerspective curPersp = ps.getSelectedElement();
			if (curPersp != null) {
				MWindow win = modelService.getTopLevelWindowFor(curPersp);
				MPartStack eStack = getEditorStack(win);
				CTabFolder ctf = (CTabFolder) eStack.getWidget();
				if (ctf != null) {