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, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/asset_library.cc b/source/blender/blenkernel/intern/asset_library.cc
index 6c4660ae75d..aae8a289d32 100644
--- a/source/blender/blenkernel/intern/asset_library.cc
+++ b/source/blender/blenkernel/intern/asset_library.cc
@@ -128,6 +128,11 @@ void AssetLibrary::load(StringRefNull library_root_directory)
   this->catalog_service = std::move(catalog_service);
 }
 
+void AssetLibrary::refresh()
+{
+  this->catalog_service->reload_catalogs();
+}
+
 namespace {
 void asset_library_on_save_post(struct Main *main,
                                 struct PointerRNA **pointers,