Bug 34159 [Tasks] First three columns of Task List too wide w/native table
The type, completion, and priority columns of the Task list using the native table widget on MacOS X are much wider than are necessary for displaying the icons in those columns and appear not to be resizable.
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/tasklist/TaskList.java
public void dispose() {
		super.dispose();
		getSite().getPage().removePartListener(partListener);
		if (focusSelectionProvider != null) {
			focusSelectionProvider.removeSelectionChangedListener(
				focusSelectionChangedListener);
			focusSelectionProvider = null;
		}
		focusPart = null;
		if (editorActionHandler != null) {
			editorActionHandler.dispose();
			editorActionHandler = null;
		}
		if (clipboard != null)
			clipboard.dispose();
	}
	/**
	 * Activates the editor on the given marker.
	 */
	public void edit(IMarker marker) {
		viewer.editElement(marker, 3);
	}
	/**
	 * Fills the local tool bar and menu manager with actions.
	 */
	void fillActionBars() {
		IActionBars actionBars = getViewSite().getActionBars();
		IMenuManager menu = actionBars.getMenuManager();
		IMenuManager submenu = new MenuManager(TaskListMessages.getString("SortByMenu.text")); 
		menu.add(submenu);