Fix T45148, stupid own mistake, the two functions are not the same,

shouldn't have collapsed them

source/blender/editors/animation/anim_markers.c

@@ -521,6 +521,9 @@ static int ed_markers_poll_markers_exist(bContext *C)
 {
 	ListBase *markers = ED_context_get_markers(C);
 	
+	if (ts->lock_markers)
+		return 0;
+
 	/* first things first: markers can only exist in timeline views */
 	if (ED_operator_animview_active(C) == 0)
 		return 0;