@Override
    public ICompletionProposal[] computeQuickAssistProposals(
        IQuickAssistInvocationContext invocationContext) {
      IAnnotationModel amodel = invocationContext.getSourceViewer().getAnnotationModel();
      IDocument doc = invocationContext.getSourceViewer().getDocument();

      int offset = invocationContext.getOffset();
      Iterator<?> it = amodel.getAnnotationIterator();
      TreeSet<ICompletionProposal> proposalSet =
          new TreeSet<>(
              new Comparator<Object>() {

                @Override
                public int compare(Object o1, Object o2) {
                  if (o1 instanceof ICompletionProposal && o2 instanceof ICompletionProposal) {
                    ICompletionProposal proposal1 = (ICompletionProposal) o1;
                    ICompletionProposal proposal2 = (ICompletionProposal) o2;
                    return proposal1
                        .getDisplayString()
                        .compareToIgnoreCase(proposal2.getDisplayString());
                  }
                  return 0;
                }
              });
      while (it.hasNext()) {
        Object key = it.next();
        if (!(key instanceof SimpleMarkerAnnotation)) {
          if (key instanceof SpellingAnnotation) {
            SpellingAnnotation annotation = (SpellingAnnotation) key;
            if (amodel.getPosition(annotation).overlapsWith(offset, 1)) {
              ICompletionProposal[] proposals = annotation.getSpellingProblem().getProposals();
              for (ICompletionProposal proposal : proposals) {
                proposalSet.add(proposal);
              }
            }
          }
          continue;
        }

        SimpleMarkerAnnotation annotation = (SimpleMarkerAnnotation) key;
        populateDataModelForAnnotation(annotation);
        IMarker marker = annotation.getMarker();

        IMarkerResolution[] mapping = fResMap.get(marker);
        if (mapping != null) {
          Position pos = amodel.getPosition(annotation);
          try {
            int line = doc.getLineOfOffset(pos.getOffset());
            int start = pos.getOffset();
            String delim = doc.getLineDelimiter(line);
            int delimLength = delim != null ? delim.length() : 0;
            int end = doc.getLineLength(line) + start - delimLength;
            if (offset >= start && offset <= end) {
              for (IMarkerResolution markerResolution : mapping) {
                PDECompletionProposal proposal =
                    new PDECompletionProposal(markerResolution, pos, marker);
                if (!proposalSet.contains(proposal)) {
                  proposalSet.add(proposal);
                }
              }
            }
          } catch (BadLocationException e) {
          }
        }
      }

      return proposalSet.toArray(new ICompletionProposal[proposalSet.size()]);
    }
 @Override
 public int hashCode() {
   return fPosition.hashCode() + fResolution.hashCode();
 }