Bug 91899 [Markers] IMarker.setAttribute fails when attributeName = IMarker.LOCATION
Calling setAttribute(IMarker.LOCATION, "foo") on an IMarker instance does nothing---the "Location" column in the Problem View remains blank.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/ConcreteMarker.java
/* (non-Javadoc)
	 * @see org.eclipse.ui.views.markers.internal.MarkerNode#getParent()
	 */
	public MarkerNode getParent() {
		return markerCategory;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.views.markers.internal.MarkerNode#isConcrete()
	 */
	public boolean isConcrete() {
		return true;
	}
	/**
	 * Return the short name for the folder.
	 * @return String
	 */
	public String getShortFolder() {
		if(shortFolder == null)
			shortFolder = Util.getShortContainerName(marker);
		return shortFolder;
	}
	/**
	 * Return the subcategory for the receiver.
	 * @return String
	 */
	public String getSubCategory() {
		return subCategory ;
	}
}