Bug 219483 [Markers] MarkerField needs to support font and colours
Some users want to be able to set the font and colour of an entry in the markers view. We should pass in a ViewerCell for this.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerPriorityField.java
*     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.ui.internal.views.markers;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.ComboBoxCellEditor;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.views.markers.MarkerField;
import org.eclipse.ui.views.markers.MarkerItem;
import org.eclipse.ui.views.markers.MarkerSupportConstants;
import org.eclipse.ui.views.markers.internal.MarkerMessages;
/**
 * MarkerPriorityField is the field for task priority.
 * 
 * @since 3.4
 * 
 */
public class MarkerPriorityField extends MarkerField {
	static final String HIGH_PRIORITY_IMAGE_PATH = "$nl$/icons/full/obj16/hprio_tsk.gif"; 
	static final String LOW_PRIORITY_IMAGE_PATH = "$nl$/icons/full/obj16/lprio_tsk.gif"; 
	private static String[] priorities = new String[] {
			MarkerMessages.priority_low, MarkerMessages.priority_normal,
			MarkerMessages.priority_high };
	private class PriorityEditingSupport extends EditingSupport {