UI: Indicate asset data-blocks with an icon in Outliners & search menus

It's useful to easily see which data-blocks are assets and which not. So just
like we usually show the library linking/override icons, we show the asset icon
there (these are mutually exclusive data-block states).

Uses the `'MAT_SPHERE_SKY` icon, which wasn't used before (except by an
add-on!) and is sorta fitting, but not quite. We should either change this one
or add an own asset icon. Meanwhile this isn't too bad :)

Also adds an internal macro to check if a data-block is an asset, consistent to
how we do it for libraries and library overrides.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index 1c09dc6f4df..08e9ea31b53 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -2199,6 +2199,9 @@ int UI_icon_from_library(const ID *id)
   if (ID_IS_OVERRIDE_LIBRARY(id)) {
     return ICON_LIBRARY_DATA_OVERRIDE;
   }
+  if (ID_IS_ASSET(id)) {
+    return ICON_MAT_SPHERE_SKY;
+  }
 
   return ICON_NONE;
 }