Bug 88352 Operation supports leaks contexts via action handler
I20050315-1100 Susan, this is a different leak from the one that I reported. Test Case: 1. open text editor 2. close text editor ==> DefaultUndoManager is leaked due to undo/redo actions handlers still holding on to the context.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
* Tries to convert the page input to a resource, either directly or via IAdaptable.
     * If the resource is a container, it uses that.
     * If the resource is a file, it uses its parent folder.
     * If a resource could not be obtained, it uses the workspace root.
     * 
     * @since 2.0
     */
    protected IAdaptable getInitialInput() {
        IAdaptable input = getSite().getPage().getInput();
        if (input != null) {
            IResource resource = null;
            if (input instanceof IResource) {
                resource = (IResource) input;
            } else {
                resource = (IResource) input.getAdapter(IResource.class);
            }
            if (resource != null) {
                switch (resource.getType()) {
                case IResource.FILE:
                    return resource.getParent();
                case IResource.FOLDER:
                case IResource.PROJECT:
                case IResource.ROOT:
                    return (IContainer) resource;
                default:
                    
                    break;
                }
            }
        }