Bug 114615 [Markers] No feedback for 'Completed' tasks
There's not longer any 'check box' indicator on the Tasks View so clients can't determine whether a task has been completed or not... This is a regression...
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/TableView.java
* Get the IWorkbenchSiteProgressService for the receiver.
	 * 
	 * @return IWorkbenchSiteProgressService or <code>null</code>.
	 */
	protected IWorkbenchSiteProgressService getProgressService() {
		IWorkbenchSiteProgressService service = null;
		Object siteService = getSite().getAdapter(
				IWorkbenchSiteProgressService.class);
		if (siteService != null)
			service = (IWorkbenchSiteProgressService) siteService;
		return service;
	}
	/**
	 * Set the filters action.
	 * 
	 * @param action
	 */
	void setFilterAction(FiltersAction action) {
		filtersAction = action;
	}
	/**
	 * Return the filter action for the receiver.
	 * 
	 * @return IAction
	 */
	IAction getFilterAction() {
		return filtersAction;
	}
	/**
	 * Return the preferences action.