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, 4 insertions, 0 deletions

diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index b5f6caf4cb7..081e76e3d5b 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -462,6 +462,10 @@ typedef struct wmNotifier {
 #define ND_ASSET_LIST (1 << 16)
 #define ND_ASSET_LIST_PREVIEW (2 << 16)
 #define ND_ASSET_LIST_READING (3 << 16)
+/* Catalog data changed, requiring a redraw of catalog UIs. Note that this doesn't denote a
+ * reloading of asset libraries & their catalogs should happen. That only happens on explicit user
+ * action. */
+#define ND_ASSET_CATALOGS (4 << 16)
 
 /* subtype, 256 entries too */
 #define NOTE_SUBTYPE 0x0000FF00