Add keyboard shortcut to toggle video looping in scene player (#3902)

* Use shift+L to toggle video looping in scene player

ui/v2.5/src/components/ScenePlayer/ScenePlayer.tsx

@@ -81,6 +81,12 @@ function handleHotkeys(player: VideoJsPlayer, event: videojs.KeyboardEvent) {
       break;
   }
 
+  // toggle player looping with shift+l
+  if (event.shiftKey && event.which === 76) {
+    player.loop(!player.loop());
+    return;
+  }
+
   if (event.altKey || event.ctrlKey || event.metaKey || event.shiftKey) {
     return;
   }

ui/v2.5/src/docs/en/Manual/KeyboardShortcuts.md

@@ -78,6 +78,7 @@
 | `↑` | Increase volume 10% |
 | `↓` | Decrease volume 10% |
 | `m` | Toggle mute |
+| `Shift + l` | Toggle player looping |
 
 ### Scene Markers tab shortcuts