disable drag & drop on images

src/editor/engine/Sprite.js

@@ -107,6 +107,9 @@ export default class Sprite {
 
     setCostume (dataurl, fcn) {
         var img = document.createElement('img');
+        img.ondragstart = function () {
+            return false;
+        }
         img.src = dataurl;
         this.img = img;
         // Make a copy that is not affected by zoom transformation

src/editor/ui/Library.js

@@ -198,6 +198,9 @@ export default class Library {
         img.style.top = (7 * scaleMultiplier) + 'px';
         img.style.position = 'relative';
         img.style.height = (data.height * scale) + 'px';
+        img.ondragstart = function () {
+            return false;
+        }
         if (data.altmd5) {
             IO.getAsset(data.altmd5, drawMe);
         }

src/lobby/Home.js

@@ -300,6 +300,9 @@ export default class Home {
         if (md5) {
             IO.getAsset(md5, drawMe);
         }
+        img.ondragstart = function () {
+            return false;
+        }
         function drawMe (url) {
             img.src = url;
         }