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/PopupCloser2.java
* @param contentAssistant the content assistant
	 * @param table the table to be tracked
	 */
	public void install(ContentAssistant2 contentAssistant, Table table) {
		fContentAssistant= contentAssistant;
		fTable= table;
		if (Helper2.okToUse(fTable)) {
			fTable.addFocusListener(this);
			fScrollbar= fTable.getVerticalBar();
			if (fScrollbar != null)
				fScrollbar.addSelectionListener(this);
		}
	}
	
	/**
	 * Uninstalls this closer if previously installed.
	 */
	public void uninstall() {
		if (Helper2.okToUse(fTable)) {
			fTable.removeFocusListener(this);
			if (fScrollbar != null)
				fScrollbar.removeSelectionListener(this);
		}
	}
	
	/*
	 * @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
	 */
	public void widgetSelected(SelectionEvent e) {
		fScrollbarClicked= true;