Port optimization from gooseberry branch:

Treat scrubbing as animation.

This is checked during various updates to avoid
some costly calculations.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/animation/anim_ops.c b/source/blender/editors/animation/anim_ops.c
index 2de42933dc0..20d1dbe5751 100644
--- a/source/blender/editors/animation/anim_ops.c
+++ b/source/blender/editors/animation/anim_ops.c
@@ -148,18 +148,24 @@ static void change_frame_seq_preview_begin(bContext *C, const wmEvent *event)
 {
 	ScrArea *sa = CTX_wm_area(C);
 	if (sa && sa->spacetype == SPACE_SEQ) {
+		wmWindow *win = CTX_wm_window(C);
 		SpaceSeq *sseq = sa->spacedata.first;
 		if (ED_space_sequencer_check_show_strip(sseq)) {
 			ED_sequencer_special_preview_set(C, event->mval);
 		}
+		if (win->screen)
+			win->screen->scrubbing = true;
 	}
 }
 static void change_frame_seq_preview_end(bContext *C)
 {
 	if (ED_sequencer_special_preview_get() != NULL) {
+		wmWindow *win = CTX_wm_window(C);
 		Scene *scene = CTX_data_scene(C);
 		ED_sequencer_special_preview_clear();
 		WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
+		if (win->screen)
+			win->screen->scrubbing = false;
 	}
 }