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
} else if (proposals[i] instanceof ICompletionProposalExtension) {
								
				ICompletionProposalExtension p= (ICompletionProposalExtension) proposals[i];
				if (p.isValidFor(document, offset))
					filtered.add(p);
					
			} else {
				
				fInvocationOffset= offset;
				fComputedProposals= computeProposals(fInvocationOffset);
				return fComputedProposals;
			}
		}
		
		ICompletionProposal[] p= new ICompletionProposal[filtered.size()];
		filtered.toArray(p); 		
		return p;
	}
	/**
	 * Requests the proposal shell to take focus.
	 * 
	 * @since 3.0
	 */
	public void setFocus() {
		if (Helper2.okToUse(fProposalShell))
			fProposalShell.setFocus();		
	}
}