Bug 17423 Revert apears twice in the popup menu.
Build F1. 1) Open a java editor. 2) Popup the menu. There is only one Revert option disable as it should be. 3) Make the editor dirty. 4) Popup the menu. There are two Revert option in the menu. One after UNDO and other before FORMAT.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
asv.addTextConverter(fTabConverter);
		}
	}
	
	private void stopTabConversion() {
		if (fTabConverter != null) {
			AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
			asv.removeTextConverter(fTabConverter);
			fTabConverter= null;
		}
	}
	
	private boolean isTabConversionEnabled() {
		IPreferenceStore store= getPreferenceStore();
		return store.getBoolean(SPACES_FOR_TABS);
	}
	
	private void showOverviewRuler() {
		AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
		asv.showOverviewRuler();
	}
	
	private void hideOverviewRuler() {
		AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
		asv.hideOverviewRuler();
	}
	
	private boolean isOverviewRulerVisible() {
		IPreferenceStore store= getPreferenceStore();
		return store.getBoolean(OVERVIEW_RULER);