(3->2) Add method to update Instances across views in RecordingSession

sleap/gui/app.py

@@ -1224,8 +1224,16 @@ def plotFrame(self, *args, **kwargs):
 
     def _after_plot_update(self, frame_idx):
         """Run after plot is updated, but stay on same frame."""
+
+        video = self.state["video"]
+
+        # Redraw trails
         overlay: TrackTrailOverlay = self.overlays["trails"]
-        overlay.redraw(self.state["video"], frame_idx)
+        overlay.redraw(video, frame_idx)
+
+        # Replot connected views for multi-camera projects
+        cams_to_include = None  # TODO: make this configurable via GUI
+        self.commands.triangulateSession(cams_to_include=cams_to_include)
 
     def _after_plot_change(self, player, frame_idx, selected_inst):
         """Called each time a new frame is drawn."""