Bug 204935 [Markers] MarkersView should use fixed default widths
The MarkersView should use fixed rather than proportional widths as columns are getting very small when the workbench is restarted with a small markers view.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerPriorityField.java
static final String HIGH_PRIORITY_IMAGE_PATH = "obj16/hprio_tsk.gif"; 
    static final String LOW_PRIORITY_IMAGE_PATH = "obj16/lprio_tsk.gif"; 
	/**
	 * Return a new priority field.
	 */
	public MarkerPriorityField() {
		super();
	}
	/* (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#getColumnHeaderText()
	 */
	public String getColumnHeaderText() {