Bug 155273 [Markers] Visibility of problems view columns should be configurable
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/CachedMarkerBuilder.java
cancelJobs();
		currentMap = null;
		building = true;
		if (progressService != null) {
			progressService.schedule(markerProcessJob, SHORT_DELAY);
		} else {
			markerProcessJob.schedule(SHORT_DELAY);
		}
	}
	/**
	 * Set whether the filters are being ANDed or ORed.
	 * 
	 * @param and
	 */
	void setAndFilters(boolean and) {
		andFilters = and;
	}
	/**
	 * Set the category group.
	 * 
	 * @param group
	 *            {@link MarkerGroup} or <code>null</code>.
	 */
	void setCategoryGroup(MarkerGroup group) {
		this.categoryGroup = group;
		if (group == null)
			getComparator().setCategory(null);
		else
			getComparator().setCategory(group.getMarkerField());
		scheduleMarkerUpdate();