int y = offset.getLineNumber() * lineHeight + lineOffset;
Rectangle iconRect = new Rectangle(2, y+2, ambiguityIcon.getIconWidth()+2, ambiguityIcon.getIconHeight()+2);
if (iconRect.contains(e.getPoint())) {
// Select ambiguity
editor.select(offset.getStartOffset(), offset.getEndOffset());
// Display menu at ambiguity location
AdvancedCALEditor.IdentifierPopupMenuProvider popupProvider = editor.getPopupMenuProvider();
if (popupProvider == null) {