Fix 'outliner_scroll_view()' not reaching wanted element

Scrolling to an item after opening relevant parents can go wrong if said
parent e.g. the last in the list [as in: then the Outliner does not
scroll down all the way]
It stems from the fact that 'region->v2d.tot.ymin' is not up-to-date in
outliner_scroll_view after outliner_show_active opens up parents, 'tot'
will only update on a redraw.

Now calculate the trees height on the fly using
'outliner_tree_dimensions()'.

ref D9521
ref T82553

Maniphest Tasks: T82553

Differential Revision: https://developer.blender.org/D9523

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 382078f006b..d65dec54a20 100644
--- a/source/blender/editors/space_outliner/outliner_intern.h
+++ b/source/blender/editors/space_outliner/outliner_intern.h
@@ -251,6 +251,8 @@ TreeTraversalAction outliner_find_selected_objects(struct TreeElement *te, void
 
 void draw_outliner(const struct bContext *C);
 
+void outliner_tree_dimensions(struct SpaceOutliner *space_outliner, int *r_width, int *r_height);
+
 TreeElementIcon tree_element_get_icon(TreeStoreElem *tselem, TreeElement *te);
 
 void outliner_collection_isolate_flag(struct Scene *scene,
@@ -525,7 +527,7 @@ bool outliner_tree_traverse(const SpaceOutliner *space_outliner,
 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_scroll_view(struct SpaceOutliner *space_outliner, struct ARegion *region, int delta_y);
 void outliner_tag_redraw_avoid_rebuild_on_open_change(const struct SpaceOutliner *space_outliner,
                                                       struct ARegion *region);