Add multiFrames option (WIP)

src/canvas/view/CanvasView.js

@@ -64,7 +64,7 @@ module.exports = Backbone.View.extend({
   },
 
   onWheel(ev) {
-    if (ev.ctrlKey || ev.metaKey) {
+    if ((ev.ctrlKey || ev.metaKey) && this.em.getConfig('multiFrames')) {
       this.preventDefault(ev);
       const { model } = this;
       const delta = Math.max(-1, Math.min(1, ev.wheelDelta || -ev.detail));

src/editor/config/config.js

@@ -306,5 +306,8 @@ module.exports = {
   textViewCode: 'Code',
 
   // Keep unused styles within the editor
-  keepUnusedStyles: 0
+  keepUnusedStyles: 0,
+
+  // TODO
+  multiFrames: 0
 };