Fix #712: fire 'change' event on file upload (#714)

Author: rr-

common/content/buffer.js

@@ -1192,6 +1192,7 @@ const Buffer = Module("buffer", {
             liberator.assert(file.exists());
 
             elem.value = file.path;
+            elem.dispatchEvent(events.create(elem.ownerDocument, 'change', {}));
         }, {
             completer: completion.file,
             default: elem.value

common/content/events.js

@@ -356,12 +356,19 @@ const Events = Module("events", {
                 ctrlKey: false, altKey: false, shiftKey: false, metaKey: false,
                 button: 0,
                 relatedTarget: null
+            },
+            UI: {
+                type: type,
+                bubbles: true, cancelable: true,
+                view: doc.defaultView,
+                detail: 1
             }
         };
         const TYPES = {
             click: "Mouse", mousedown: "Mouse", mouseup: "Mouse",
             mouseover: "Mouse", mouseout: "Mouse",
-            keypress: "Key", keyup: "Key", keydown: "Key"
+            keypress: "Key", keyup: "Key", keydown: "Key",
+            change: "UI"
         };
         var t = TYPES[type];
         var evt = doc.createEvent(t + "Events");