Fix T52840: New Depsgraph - Mask editor not working correctly

source/blender/blenkernel/intern/mask.c

@@ -51,6 +51,7 @@
 
 #include "BKE_animsys.h"
 #include "BKE_curve.h"
+#include "BKE_depsgraph.h"
 #include "BKE_global.h"
 #include "BKE_library.h"
 #include "BKE_main.h"
@@ -817,6 +818,8 @@ Mask *BKE_mask_new(Main *bmain, const char *name)
 	mask->sfra = 1;
 	mask->efra = 100;
 
+	DAG_relations_tag_update(bmain);
+
 	return mask;
 }