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
if (elt instanceof CSSStylableElement) {
				CSSStylableElement stylableElement = (CSSStylableElement) elt;
				CSSStyleDeclaration oldDefaultStyleDeclaration = stylableElement
						.getDefaultStyleDeclaration(pseudoE);
				
				
				
				CSSStyleDeclaration defaultStyleDeclaration = getDefaultStyleDeclaration(
						element, newStyle, pseudoE);
				if (oldDefaultStyleDeclaration != null) {
					
					
					try {
						throwError = false;
						applyStyleDeclaration(element, defaultStyleDeclaration,
								pseudoE);
					} finally {
						throwError = true;
					}
				}
			}
			if (applyStylesToChildNodes) {
				/*
				 * Style all children recursive.
				 */
				NodeList nodes = elt.getChildNodes();
				if (nodes != null) {
					for (int k = 0; k < nodes.getLength(); k++) {
						applyDefaultStyleDeclaration(nodes.item(k),
								applyStylesToChildNodes);