Moving transaction ID generation to JavaScript, for clip/transition moving logic - when using multiple clips/transitions in a undo/redo group. This was breaking on macOS when trying to call the Python UUID method.

Author: jonoomph

src/timeline/js/directives/track.js

@@ -70,7 +70,7 @@ App.directive("tlTrack", function ($timeout) {
           var selected_item_count = ui_selected.length;
 
           // Get uuid to group all these updates as a single transaction
-          var tid = timeline.get_uuid();
+          var tid = uuidv4();
           var drop_track_num = -1;
 
           // with each dragged clip, find out which track they landed on

src/timeline/js/functions.js

@@ -28,6 +28,13 @@
 
 /*global bounding_box, global_primes*/
 
+// Generate a UUID
+function uuidv4() {
+  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
+      (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
+  );
+}
+
 // Find a JSON element / object with a particular value in the json data
 function findElement(arr, propName, propValue) {
   // Loop through array looking for a matching element