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
if (!showSelections()) {
			return true;
		}
		IResource[] resources = getResources();
		IResource resource2;
		if (showOwnerProject()) {
			IProject project;
			for (int i = 0, l = resources.length; i < l; i++) {
				resource2 = resources[i];
				if (resource2 == null) {
					return true;
				} else {
					project = resource2.getProject();
					if (project == null || project.equals(resource.getProject()))
						return true;
				}
			}
		}
		if (showChildrenHierarchy()) {
			for (int i = 0, l = resources.length; i < l; i++) {
				resource2 = resources[i];
				if (resource2 != null && resource2.getFullPath().isPrefixOf(resource.getFullPath()))
					return true;
			}
		} else 
			for (int i = 0, l = resources.length; i < l; i++) {
				resource2 = resources[i];
				if (resource.equals(resource2))
					return true;
			}