Bug 33389 Read-Only files: Quick fix enabled and gets checkmark!
RC1 1. set a file to ready only. 2. Open the file an set the cursor inside 3. Open the 'Edit' menu. Note that 'Quick fix' is enabled, but 'Content assist' is not 4. Choose 'Quick fix' 5. Open the context menu: Quick fix got a checkmark!
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
void customizeDocumentCommand(IDocument document, DocumentCommand command);
	};
	
	class AdaptedSourceViewer extends JavaSourceViewer  {
				
		private List fTextConverters;
		private boolean fIgnoreTextConverters= false;
		private JavaCorrectionAssistant fCorrectionAssistant;
		
		public AdaptedSourceViewer(Composite parent, IVerticalRuler verticalRuler, IOverviewRuler overviewRuler, boolean showAnnotationsOverview, int styles) {
			super(parent, verticalRuler, overviewRuler, showAnnotationsOverview, styles);
		}
				
		public IContentAssistant getContentAssistant() {
			return fContentAssistant;
		}
		
		/*
		 * @see ITextOperationTarget#doOperation(int)
		 */
		public void doOperation(int operation) {
		
			if (getTextWidget() == null)