Conversation view handles drag n drop events

By forwarding them to its file input.

// FREEBIE

js/views/conversation_view.js

@@ -201,6 +201,12 @@
             'select .message-list .entry': 'messageDetail',
             'force-resize': 'forceUpdateMessageFieldSize',
             'show-identity': 'showSafetyNumber'
+            'dragover': 'sendToFileInput',
+            'drop': 'sendToFileInput',
+            'dragleave': 'sendToFileInput'
+        },
+        sendToFileInput: function(e) {
+            this.fileInput.$el.trigger(e);
         },
 
         onPrune: function() {