Bug 155273 [Markers] Visibility of problems view columns should be configurable
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
}
					getViewer().setSelection(
							new StructuredSelection(newSelection.toArray()),
							true);
					preservedSelection.clear();
				}
				if (getViewer().getTree().getItemCount() > 0)
					getViewer().getTree().setTopItem(
							getViewer().getTree().getItem(0));
				reexpandCategories(builder);
				return Status.OK_STATUS;
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.ui.progress.WorkbenchJob#shouldRun()
			 */
			public boolean shouldRun() {
				return !builder.isBuilding()
						&& IDEWorkbenchPlugin.getDefault().getBundle()
								.getState() == Bundle.ACTIVE;
			}
		};
		updateJob.setSystem(true);
		return updateJob;
	}
	/**
	 * Return the object that is the input to the viewer.
	 * 
	 * @return Object