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
return parsePropertyValue(reader);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.ui.core.css.engine.CSSEngine#parsePropertyValue(org.w3c.css.sac.InputSource)
	 */
	public CSSValue parsePropertyValue(InputSource source) throws IOException {
		checkInputSource(source);
		CSSParser parser = makeCSSParser();
		return parser.parsePropertyValue(source);
	}
	
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.ui.css.core.engine.CSSEngine#applyStyles(java.lang.Object,
	 *      boolean)
	 */
	public void applyStyles(Object element, boolean applyStylesToChildNodes) {
		applyStyles(element, applyStylesToChildNodes, computeDefaultStyle);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.ui.css.core.engine.CSSEngine#applyStyles(java.lang.Object,
	 *      boolean, boolean)
	 */
	public void applyStyles(Object element, boolean applyStylesToChildNodes,
			boolean computeDefaultStyle) {