diff -r 539c9bee5372 -r 7623f9af9272 src/js/model.js
--- a/src/js/model.js	Fri Sep 25 14:45:38 2015 +0200
+++ b/src/js/model.js	Fri Oct 02 11:27:17 2015 +0200
@@ -762,6 +762,19 @@
 
 extendPrototype(Annotation, BaseElement);
 
+/* Set begin and end in one go, to avoid undesired side-effects in
+ * setBegin/setEnd interaction */
+Annotation.prototype.setBeginEnd = function(_beginMs, _endMs) {
+    _beginMs = Math.max(0,_beginMs);
+    _endMs = Math.max(0,_endMs);
+    if (_endMs < _beginMs)
+        _endMs = _beginMs;
+    this.begin.setMilliseconds(_beginMs);
+    this.end.setMilliseconds(_endMs);
+    this.trigger("change-begin");
+    this.trigger("change-end");
+};
+
 Annotation.prototype.setBegin = function(_beginMs) {
     this.begin.setMilliseconds(Math.max(0,_beginMs));
     this.trigger("change-begin");