Bug 205049 Other plug-ins should be able to define default content generator
Currently only the content generator can define which plug-ins it can be the default for - we need a way for plug-ins to refer back to the marker support for thier own generator.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
}
		return (IResource[]) result.toArray(new IResource[result.size()]);
	}
	/**
	 * Get the fields that this content generator is displaying.
	 * 
	 * @return {@link MarkerField}[]
	 */
	public MarkerField[] getVisibleFields() {
		return visibleFields;
	}
	/**
	 * Initialise the receiver from the configuration element. This is done as a
	 * post processing step.
	 * 
	 * @param registry
	 *            the MarkerSupportRegistry being used to initialise the
	 *            receiver.
	 */
	public void initializeFromConfigurationElement(
			MarkerSupportRegistry registry) {
		String categoryName = configurationElement
				.getAttribute(ATTRIBUTE_DEFAULT_MARKER_GROUPING);
		if (categoryName != null) {
			MarkerGroup group = registry.getMarkerGroup(categoryName);
			if (group != null)
				categoryGroup = group;
		}
		IConfigurationElement[] elements = configurationElement
				.getChildren(MARKER_FIELD_REFERENCE);