Assets: add global `bke::AssetLibraryService` class

Add `blender::bke::AssetLibraryService` class that acts like a
blendfile-scoped singleton. It's allocated upon the first call to
`BKE_asset_library_load` and destroyed in the LOAD-PRE handler.

The `AssetLibraryService` ensures that edits to asset catalogs are not
lost when the asset browser editor closes (or even reloads). Instead,
the `AssetLibrary` pointers it owns are kept around as long as the blend
file is open.

Reviewed By: Severin

Maniphest Tasks: T92151

Differential Revision: https://developer.blender.org/D12885

1 files changed, 2 insertions, 4 deletions

diff --git a/source/blender/editors/space_file/filelist.c b/source/blender/editors/space_file/filelist.c
index 773a321da5c..fc502b065f3 100644
--- a/source/blender/editors/space_file/filelist.c
+++ b/source/blender/editors/space_file/filelist.c
@@ -391,7 +391,7 @@ typedef struct FileList {
   eFileSelectType type;
   /* The library this list was created for. Stored here so we know when to re-read. */
   AssetLibraryReference *asset_library_ref;
-  struct AssetLibrary *asset_library;
+  struct AssetLibrary *asset_library; /* Non-owning pointer. */
 
   short flags;
 
@@ -1847,9 +1847,7 @@ void filelist_clear_ex(struct FileList *filelist,
   }
 
   if (do_asset_library && (filelist->asset_library != NULL)) {
-    /* There is no way to refresh the catalogs stored by the AssetLibrary struct, so instead of
-     * "clearing" it, the entire struct is freed. It will be reallocated when needed. */
-    BKE_asset_library_free(filelist->asset_library);
+    /* The AssetLibraryService owns the AssetLibrary pointer, so no need for us to free it. */
     filelist->asset_library = NULL;
   }
 }