Bug 42587 Left over from content assist
M3 - set preference that content assist should overwrite - open content assist on some word so that the rest of the word is indicated to be overwritten - transfer focus to the content assist widget using TAB - Esc -> overwrite indication is still there
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/link/contentassist/CompletionProposalPopup2.java
private ITextViewer fViewer;
	
	private ContentAssistant2 fContentAssistant;
	
	private AdditionalInfoController2 fAdditionalInfoController;
	
	private PopupCloser2 fPopupCloser= new PopupCloser2();
	
	private Shell fProposalShell;
	
	private Table fProposalTable;
	
	private boolean fInserting= false;
	
	private KeyListener fKeyListener;
	
	private List fDocumentEvents= new ArrayList();
	
	private IDocumentListener fDocumentListener;
	
	private long fInvocationCounter= 0;