Bug 49274 [Activities] Cannot open preference dialog if previous selected node not in fitlered list
M6 You cannot open the preference dialog if the previously selected preference is in the filtered list due to a walkback STEPS 1) Open the preference dialog 2) Select a raw entry that is not in the filtered list 3) Cancel 4) Attempt to reopen - it will try to select a non-esistant node. It should just drop the selection if it isn't there (or not save a selection from the raw list to start with). org.eclipse.jface.util.Assert$AssertionFailedException: Assertion failed: at org.eclipse.jface.util.Assert.isTrue(Assert.java:168) at org.eclipse.jface.util.Assert.isTrue(Assert.java:154) at org.eclipse.jface.preference.PreferenceNode.findSubNode (PreferenceNode.java:177) at org.eclipse.jface.preference.PreferenceContentProvider.findParent (PreferenceContentProvider.java:42) at org.eclipse.jface.preference.PreferenceContentProvider.getParent (PreferenceContentProvider.java:80) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand (AbstractTreeViewer.java:893) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand (AbstractTreeViewer.java:895) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand (AbstractTreeViewer.java:895) at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget (AbstractTreeViewer.java:1370) at org.eclipse.jface.viewers.StructuredViewer.setSelectionToWidget (StructuredViewer.java:1066) at org.eclipse.jface.viewers.StructuredViewer.setSelection (StructuredViewer.java:1031) at org.eclipse.jface.preference.PreferenceDialog.selectSavedItem (PreferenceDialog.java:818) at org.eclipse.jface.preference.PreferenceDialog$3.run (PreferenceDialog.java:332) at org.eclipse.swt.custom.BusyIndicator.showWhile (BusyIndicator.java:84) at org.eclipse.jface.preference.PreferenceDialog.createContents (PreferenceDialog.java:327) at org.eclipse.jface.window.Window.create(Window.java:305) at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:883) at org.eclipse.ui.internal.OpenPreferencesAction.run (OpenPreferencesAction.java:70) at org.eclipse.jface.action.Action.runWithEvent(Action.java:842) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection (ActionContributionItem.java:509) at org.eclipse.jface.action.ActionContributionItem.access$2 (ActionContributionItem.java:461) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent (ActionContributionItem.java:408) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:847) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2311) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1992) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1506) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1482) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench (Workbench.java:246) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:139) at org.eclipse.ui.internal.ide.IDEApplication.run (IDEApplication.java:47) at org.eclipse.core.internal.runtime.PlatformActivator$1.run (PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run (EclipseStarter.java:85) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.eclipse.core.launcher.Main.basicRun(Main.java:279) at org.eclipse.core.launcher.Main.run(Main.java:742) at org.eclipse.core.launcher.Main.main(Main.java:581)
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
/**
	 * @param parent the SWT parent for the tree area controls.
	 * @return the new <code>Control</code>.
	 * @since 3.0
	 */
	protected Control createTreeAreaContents(Composite parent) {
		
		treeViewer = createTreeViewer(parent);
		treeViewer.setLabelProvider(new PreferenceLabelProvider());
		treeViewer.setContentProvider(new PreferenceContentProvider());
		treeViewer.setInput(preferenceManager);
		layoutTreeAreaControl(treeViewer.getControl());
		return treeViewer.getControl();
	}
	/**
	 * Create a new <code>TreeViewer</code>.
	 * @param parent the parent <code>Composite</code>.
	 * @return the <code>TreeViewer</code>.
	 * @since 3.0
	 */
	protected TreeViewer createTreeViewer(Composite parent) {
		final TreeViewer viewer = new TreeViewer(parent, SWT.BORDER);
		viewer.addPostSelectionChangedListener(new ISelectionChangedListener() {
			private void handleError() {
				try {
					 
					 
					
					viewer.removePostSelectionChangedListener(this);
					showPageFlippingAbortDialog();