Asset Catalogs: support reloading without losing local changes

Keep track of unsaved asset catalog changes, in a more granular way than
just one boolean per asset library. Individual catalogs can now be
marked with a flag `has_unsaved_changes`. This is taken into account
when reloading data from the catalog definition file (CDF):

- New catalog in CDF: gets loaded
- Already-known catalog in CDF:
    - local unsaved changes: on-disk catalog is ignored
    - otherwise: on-disk catalog replaces in-memory one
- Already-known catalog that does not exist in CDF:
    - local unsaved changes: catalog is kept around
    - otherwise: catalog is deleted.

Because this saving-is-also-loading behaviour, the "has unsaved changes"
flags are all stored in the undo buffer; undoing after saving will not
change the CDF, but at least it'll undo the loading from disk, and it'll
re-mark any changes as "not saved".

Reviewed By: Severin

Differential Revision: https://developer.blender.org/D12967

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/asset_library_service.cc b/source/blender/blenkernel/intern/asset_library_service.cc
index aeded0bc128..7cf95ee4cc1 100644
--- a/source/blender/blenkernel/intern/asset_library_service.cc
+++ b/source/blender/blenkernel/intern/asset_library_service.cc
@@ -77,7 +77,9 @@ AssetLibrary *AssetLibraryService::get_asset_library_on_disk(StringRefNull top_l
   AssetLibraryPtr *lib_uptr_ptr = on_disk_libraries_.lookup_ptr(top_dir_trailing_slash);
   if (lib_uptr_ptr != nullptr) {
     CLOG_INFO(&LOG, 2, "get \"%s\" (cached)", top_dir_trailing_slash.c_str());
-    return lib_uptr_ptr->get();
+    AssetLibrary *lib = lib_uptr_ptr->get();
+    lib->refresh();
+    return lib;
   }
 
   AssetLibraryPtr lib_uptr = std::make_unique<AssetLibrary>();