Asset Browser: Improved workflow for asset catalog saving

No longer save asset catalogs on blendfile save. Instead:

- extend the confirmation prompt for unsaved changes to show unsaved
  catalogs.
- In the confirmation prompt, make catalog saving explicit & optional,
  just like we do it for external images. {F10881736}
- In the Asset Browser catalog tree, show an operator icon to save the
  catalogs to disk. It's grayed out if there are no changes to save, or
  if the .blend wasn't saved yet (required to know where to save the
  catalog definitions to). {F10881743}

Much of the work was done by @Severin and reviewed by me, then we
swapped roles.

Reviewed By: Severin

Differential Revision: https://developer.blender.org/D12796

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/asset_library_service.hh b/source/blender/blenkernel/intern/asset_library_service.hh
index 63ffe56ab74..03df706bc42 100644
--- a/source/blender/blenkernel/intern/asset_library_service.hh
+++ b/source/blender/blenkernel/intern/asset_library_service.hh
@@ -66,6 +66,9 @@ class AssetLibraryService {
   /** Get the "Current File" asset library. */
   AssetLibrary *get_asset_library_current_file();
 
+  /** Returns whether there are any known asset libraries with unsaved catalog edits. */
+  bool has_any_unsaved_catalogs() const;
+
  protected:
   static std::unique_ptr<AssetLibraryService> instance_;