Add custom properties to sequence strips

source/blender/blenkernel/intern/sequencer.c

@@ -66,6 +66,7 @@
 #include "BKE_scene.h"
 #include "BKE_mask.h"
 #include "BKE_library.h"
+#include "BKE_idprop.h"
 
 #include "RNA_access.h"
 
@@ -210,6 +211,11 @@ static void BKE_sequence_free_ex(Scene *scene, Sequence *seq, const bool do_cach
 		seq_free_animdata(scene, seq);
 	}
 
+	if (seq->prop) {
+		IDP_FreeProperty(seq->prop);
+		MEM_freeN(seq->prop);
+	}
+
 	/* free modifiers */
 	BKE_sequence_modifier_clear(seq);
 
@@ -4630,6 +4636,10 @@ static Sequence *seq_dupli(Scene *scene, Scene *scene_to, Sequence *seq, int dup
 		seqn->strip->proxy->anim = NULL;
 	}
 
+	if (seq->prop) {
+		seqn->prop = IDP_CopyProperty(seq->prop);
+	}
+
 	if (seqn->modifiers.first) {
 		BLI_listbase_clear(&seqn->modifiers);