Bug 208052 [Markers] Tasks does not sort by completion
Sorting by the completion currently does nothing.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerCompletionField.java
}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerField#getDefaultColumnWidth(org.eclipse.swt.widgets.Control)
	 */
	public int getDefaultColumnWidth(Control control) {
		return getCompleteImage().getBounds().width + IDialogConstants.BUTTON_MARGIN;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.provisional.views.markers.MarkerField#getColumnHeaderText()
	 */
	public String getColumnHeaderText() {
		return MarkerSupportConstants.EMPTY_STRING;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.provisional.views.markers.MarkerField#getValue(org.eclipse.ui.internal.provisional.views.markers.MarkerItem)
	 */
	public String getValue(MarkerItem item) {
		return MarkerSupportConstants.EMPTY_STRING;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.provisional.views.markers.MarkerField#getImage(org.eclipse.ui.internal.provisional.views.markers.MarkerItem)
	 */
	public Image getImage(MarkerItem item) {
		int done = -1;