Fix Recursion when rendering scene strip

Recursion happens in case when scene strip point to it's own scene
indirectly by using SEQ_SCENE_STRIPS option.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D9264

source/blender/sequencer/intern/sequencer.c

@@ -6045,6 +6045,12 @@ static Sequence *sequencer_check_scene_recursion(Scene *scene, ListBase *seqbase
       return seq;
     }
 
+    if (seq->type == SEQ_TYPE_SCENE && (seq->flag & SEQ_SCENE_STRIPS)) {
+      if (sequencer_check_scene_recursion(scene, &seq->scene->ed->seqbase)) {
+        return seq;
+      }
+    }
+
     if (seq->type == SEQ_TYPE_META && sequencer_check_scene_recursion(scene, &seq->seqbase)) {
       return seq;
     }