Depsgraph: Need to tag relations for update after new clip was added

source/blender/editors/space_clip/clip_ops.c

@@ -56,6 +56,7 @@
 
 #include "BKE_context.h"
 #include "BKE_global.h"
+#include "BKE_depsgraph.h"
 #include "BKE_report.h"
 #include "BKE_library.h"
 #include "BKE_main.h"
@@ -247,6 +248,7 @@ static int open_exec(bContext *C, wmOperator *op)
 
 	WM_event_add_notifier(C, NC_MOVIECLIP | NA_ADDED, clip);
 
+	DAG_relations_tag_update(bmain);
 	MEM_freeN(op->customdata);
 
 	return OPERATOR_FINISHED;

source/blender/makesrna/intern/rna_main_api.c

@@ -543,9 +543,13 @@ static MovieClip *rna_Main_movieclip_load(Main *bmain, ReportList *reports, cons
 		clip = BKE_movieclip_file_add(bmain, filepath);
 	}
 
-	if (!clip)
+	if (clip != NULL) {
+		DAG_relations_tag_update(bmain);
+	}
+	else {
 		BKE_reportf(reports, RPT_ERROR, "Cannot read '%s': %s", filepath,
 		            errno ? strerror(errno) : TIP_("unable to load movie clip"));
+	}
 
 	id_us_min((ID *)clip);
 	return clip;