1 files changed, 9 insertions, 0 deletions
diff --git a/src/client/views/collections/CollectionStackedTimeline.tsx b/src/client/views/collections/CollectionStackedTimeline.tsx
index b6321043c..f533bee52 100644
--- a/src/client/views/collections/CollectionStackedTimeline.tsx
+++ b/src/client/views/collections/CollectionStackedTimeline.tsx
@@ -145,12 +145,21 @@ export class CollectionStackedTimeline extends CollectionSubView<
             })!;
     }
 
+    _disposer: IReactionDisposer | undefined;
     componentDidMount() {
         document.addEventListener("keydown", this.keyEvents, true);
+        this._disposer = reaction(() => this.currentTime,
+            () => {
+                if (CollectionStackedTimeline.SelectingRegion === this) {
+                    this._markerEnd = this.currentTime;
+                }
+
+            });
     }
 
     @action
     componentWillUnmount() {
+        this._disposer?.();
         document.removeEventListener("keydown", this.keyEvents, true);
         if (CollectionStackedTimeline.SelectingRegion === this) {
             CollectionStackedTimeline.SelectingRegion = undefined;