Cleanup: Move Outliner runtime hash into internal runtime struct, out of DNA

This way Outliner internal data stays internal, non-Outliner code will not be
able to access and mess with this. Further it allows us to use the real type
(rather than `void *`), change the type to a C++ container if needed and
slightly reduces the size for every Outliner stored in files.

Slightly changed how we set the `SO_TREESTORE_REBUILD` for this, but it should
effectively behave the same way as before.

1 files changed, 6 insertions, 3 deletions

diff --git a/source/blender/editors/space_outliner/outliner_intern.h b/source/blender/editors/space_outliner/outliner_intern.h
index aefba929c5e..0b432d932ca 100644
--- a/source/blender/editors/space_outliner/outliner_intern.h
+++ b/source/blender/editors/space_outliner/outliner_intern.h
@@ -47,10 +47,13 @@ struct wmKeyConfig;
 struct wmOperatorType;
 
 typedef struct SpaceOutliner_Runtime {
-  /**
-   * Internal C++ object to create and manage the tree for a specific display type (View Layers,
-   * Scenes, Blender File, etc.). */
+  /** Internal C++ object to create and manage the tree for a specific display type (View Layers,
+   *  Scenes, Blender File, etc.). */
   struct TreeDisplay *tree_display;
+
+  /** Pointers to treestore elements, grouped by (id, type, nr)
+   *  in hashtable for faster searching */
+  struct GHash *treehash;
 } SpaceOutliner_Runtime;
 
 typedef enum TreeElementInsertType {