[lint addon] Remove confused annotation filtering

Author: marijnh

addon/lint/lint.js

@@ -199,10 +199,6 @@
       var anns = annotations[line];
       if (!anns) continue;
 
-      // filter out duplicate messages
-      var message = [];
-      anns = anns.filter(function(item) { return message.indexOf(item.message) > -1 ? false : message.push(item.message) });
-
       var maxSeverity = null;
       var tipLabel = state.hasGutter && document.createDocumentFragment();
 
@@ -220,9 +216,8 @@
           __annotation: ann
         }));
       }
-      // use original annotations[line] to show multiple messages
       if (state.hasGutter)
-        cm.setGutterMarker(line, GUTTER_ID, makeMarker(cm, tipLabel, maxSeverity, annotations[line].length > 1,
+        cm.setGutterMarker(line, GUTTER_ID, makeMarker(cm, tipLabel, maxSeverity, anns.length > 1,
                                                        options.tooltips));
 
       if (options.highlightLines)