Bug 318856 Most entries contributed by textual editors are missing in the 'Edit' menu
I20100701-1105. 1. start new workspace 2. create a Java project 3. create a file 4. open 'Edit' main menu ==> most contributed items are missing (e.g. content assist, find actions).
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/ContributionsAnalyzer.java
private MTrimContribution contribution;
		public TrimKey(MTrimContribution mc) {
			super(mc.getParentId(), mc.getPositionInParent(), mc.getTags(), (MCoreExpression) mc
					.getVisibleWhen());
			this.contribution = mc;
			mc.setWidget(this);
		}
		public MTrimContribution getContribution() {
			return contribution;
		}
	}
	private static MenuKey getKey(MMenuContribution contribution) {
		if (contribution.getWidget() instanceof MenuKey) {
			return (MenuKey) contribution.getWidget();
		}
		return new MenuKey(contribution);
	}
	private static ToolBarKey getKey(MToolBarContribution contribution) {
		if (contribution.getWidget() instanceof ToolBarKey) {