Outliner: Avoid rebuilding tree on selection/active changes

We can avoid the rather expensive outliner tree rebuilds and only redraw
if nothing but the selection or active item changes. This should give a
bit of speedup for heavy scenes.

For this to work I had to correct a few notifiers, some were only
sending selection/active change notifiers that actually did things like
adding objects. I also added a more precise notifier type for when the
active collection changes. At the notifier subtype/action level we're
not even close to running out of bits, so this should be fine.
Also had to correct a wrong notifier check (was using `&` rather than
`==`).

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/editors/space_outliner/outliner_intern.h b/source/blender/editors/space_outliner/outliner_intern.h
index 33dbbb274c0..9795bb73efe 100644
--- a/source/blender/editors/space_outliner/outliner_intern.h
+++ b/source/blender/editors/space_outliner/outliner_intern.h
@@ -237,7 +237,7 @@ void outliner_build_tree(struct Main *mainvar,
                          struct SpaceOutliner *space_outliner,
                          struct ARegion *region);
 
-bool outliner_element_needs_rebuild_on_open_change(const TreeStoreElem *tselem);
+bool outliner_mode_requires_always_rebuild(const struct SpaceOutliner *space_outliner);
 
 typedef struct IDsSelectedData {
   struct ListBase selected_array;
@@ -515,6 +515,8 @@ float outliner_restrict_columns_width(const struct SpaceOutliner *space_outliner
 TreeElement *outliner_find_element_with_flag(const ListBase *lb, short flag);
 bool outliner_is_element_visible(const TreeElement *te);
 void outliner_scroll_view(struct ARegion *region, int delta_y);
+void outliner_tag_redraw_avoid_rebuild_on_open_change(const struct SpaceOutliner *space_outliner,
+                                                      struct ARegion *region);
 
 /* outliner_sync.c ---------------------------------------------- */