Bug 318944 CSSSWTEngineImpl leaks memory
CSSSWTEngineImpl stores too many element contexts. In a memory snapshot, the HashMap size was 15559. This is most probably a leak.
bundles/org.eclipse.e4.ui.css.core/src/org/eclipse/e4/ui/css/core/impl/engine/AbstractCSSEngine.java
/**
	 * Default {@link IResourcesLocatorManager} used to get InputStream, Reader
	 * resource like Image.
	 */
	private final static IResourcesLocatorManager defaultResourcesLocatorManager = ResourcesLocatorManager.INSTANCE;
	/**
	 * w3c {@link DocumentCSS}.
	 */
	private ExtendedDocumentCSS documentCSS;
	/**
	 * w3c {@link ViewCSS}.
	 */
	private ViewCSS viewCSS;
	/**
	 * {@link IElementProvider} used to retrieve w3c Element linked to the
	 * widget.
	 */
	private IElementProvider elementProvider;