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/views/markers/MarkerField.java
*     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.ui.views.markers;
import java.net.URL;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.util.BundleUtility;
import org.eclipse.ui.internal.views.markers.MarkerEntry;
import org.eclipse.ui.internal.views.markers.MarkerSupportInternalUtilities;
/**
 * MarkerField is the abstract superclass of the definition of the content
 * providers for columns in a Markers View.
 * 
 * @since 3.4
 * 
 */
public abstract class MarkerField {
	private static final String ATTRIBUTE_FILTER_CLASS = "filterClass"; 
	private static final String ATTRIBUTE_FILTER_CONFIGURATION_CLASS = "filterConfigurationClass"; 
	IConfigurationElement configurationElement;
	/**
	 * Compare item1 and item2 for sorting purposes.