Cleanup: Nodes: Store node group idname in tree type

There was already a utility to retrieve the correct node group idname
from the context, `node_group_idname`, but often it's clearer to
use lower-level arguments, or the context isn't accessible.
Storing the group idname in the tree type makes it accessible
without rewriting it elsewhere.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 90dbec7ec52..02e3cefe6a5 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -374,6 +374,9 @@ typedef struct bNodeTreeType {
   int type;        /* type identifier */
   char idname[64]; /* identifier name */
 
+  /* The ID name of group nodes for this type. */
+  char group_idname[64];
+
   char ui_name[64];
   char ui_description[256];
   int ui_icon;