Assets: Initial Asset List as part of the Asset System design

Implements a basic, WIP version of the asset list. This is needed to
give the asset view UI template asset reading and displaying
functionality.

See:
* Asset System: Data Storage, Reading & UI Access - https://developer.blender.org/T88184

Especially the asset list internals should change. It uses the
File/Asset Browser's `FileList` API, which isn't really meant for access
from outside the File Browser. But as explained in T88184, it does a lot
of the stuff we currently need, so we (Sybren Stüvel and I) decided to
go this route for now. Work on a file-list rewrite which integrates well
with the asset system started in the `asset-system-filelist` branch.

Further includes:
* Operator to reload the asset list.
* New `bpy.types.AssetHandle.get_full_library_path()` function, which
  gets the full path of the asset via the asset-list.
* Changes to preview loading to prevent the preview loading job to run
  eternally for asset views. File Browsers have this issue too, but
  should be fixed separately.

2 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/util/ed_util.c b/source/blender/editors/util/ed_util.c
index 7bbdc58474f..73f328f85d7 100644
--- a/source/blender/editors/util/ed_util.c
+++ b/source/blender/editors/util/ed_util.c
@@ -46,6 +46,7 @@
 #include "DEG_depsgraph.h"
 
 #include "ED_armature.h"
+#include "ED_asset.h"
 #include "ED_image.h"
 #include "ED_mesh.h"
 #include "ED_object.h"
@@ -169,6 +170,8 @@ void ED_editors_init(bContext *C)
     ED_space_image_paint_update(bmain, wm, scene);
   }
 
+  ED_assetlist_storage_tag_main_data_dirty();
+
   SWAP(int, reports->flag, reports_flag_prev);
   wm->op_undo_depth--;
 }
diff --git a/source/blender/editors/util/ed_util_ops.cc b/source/blender/editors/util/ed_util_ops.cc
index 462f7768f81..7d32d252718 100644
--- a/source/blender/editors/util/ed_util_ops.cc
+++ b/source/blender/editors/util/ed_util_ops.cc
@@ -36,6 +36,7 @@
 
 #include "BLT_translation.h"
 
+#include "ED_asset.h"
 #include "ED_render.h"
 #include "ED_undo.h"
 #include "ED_util.h"
@@ -131,9 +132,11 @@ static int lib_id_generate_preview_exec(bContext *C, wmOperator *UNUSED(op))
   if (preview) {
     BKE_previewimg_clear(preview);
   }
+
   UI_icon_render_id(C, nullptr, id, ICON_SIZE_PREVIEW, true);
 
   WM_event_add_notifier(C, NC_ASSET | NA_EDITED, nullptr);
+  ED_assetlist_storage_tag_main_data_dirty();
 
   return OPERATOR_FINISHED;
 }