Bug 46164 [Tasks] Go To enabled for non-file markers
build I20031105 Go To in the Tasks view is enabled even for a manually created task. It should only be enabled for tasks on files.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/ActionOpenMarker.java
setDisabledImageDescriptor(IDEWorkbenchPlugin
				.getIDEImageDescriptor(DISABLED_IMAGE_PATH));
		setEnabled(false);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.Action#run()
	 */
	public void run() {
		IMarker[] markers = getSelectedMarkers();
		for (int i = 0; i < markers.length; i++) {
			IMarker marker = markers[i];
			
			
			
			
			IEditorPart editor = part.getSite().getPage().getActiveEditor();
			if (editor != null) {
				IEditorInput input = editor.getEditorInput();
				IFile file = ResourceUtil.getFile(input);
				if (file != null) {
					if (marker.getResource().equals(file)) {
						part.getSite().getPage().activate(editor);
					}
				}
			}
			if (marker.getResource() instanceof IFile) {
				try {
					IFile file = (IFile) marker.getResource();