自研插件：自动编组

addons/mesh_collider/mesh_collider_plugin.gd

@@ -65,6 +65,16 @@ const MENU_ADD := "Mesh Collider: 给选中模型加碰撞 / Add collision to se
 const MENU_REMOVE := "Mesh Collider: 移除选中模型的碰撞 / Remove collision"
 const MENU_SETTINGS := "Mesh Collider: 打开项目设置 / Open project settings"
 
+## The editor's own "group selected nodes" flag - the toggle next to the lock
+## icon in the Scene dock, bound to Ctrl+G.
+##
+## A node carrying it is what gets selected when any of its children is clicked
+## in the 2D/3D view, which is exactly what a model with a CollisionBody and a
+## pile of CollisionShape3D under it needs. It is a plain node meta, and Godot
+## serialises it into the scene as `metadata/_edit_group_ = true`, so setting it
+## here is all it takes - no editor-only state, nothing to re-apply on load.
+const META_GROUP := &"_edit_group_"
+
 
 func _enter_tree() -> void:
 	Settings.install()
@@ -226,11 +236,21 @@ func _inject(model: Node, source: String = "") -> bool:
 	undo.add_do_method(Collider, "prepare_for_scene", body, scene_root)
 	undo.add_do_reference(body)
 	undo.add_undo_method(model, "remove_child", body)
+	# Group the model, so clicking it in the viewport selects the model rather
+	# than the body or a shape we just hung under it. Only when it is not already
+	# grouped, so a choice made by hand is never overwritten - and the undo entry
+	# is only added in that same case, so undoing an injection cannot un-group
+	# something the user had grouped themselves.
+	var grouping := not model.has_meta(META_GROUP)
+	if grouping:
+		undo.add_do_method(model, "set_meta", META_GROUP, true)
+		undo.add_undo_method(model, "remove_meta", META_GROUP)
 	undo.commit_action()
 
 	get_editor_interface().mark_scene_as_unsaved()
-	print("[MeshCollider] %s (%s): added %s with %d shape(s)"
-		% [model.name, source.get_file(), body.get_class(), Collider.count_shapes(body)])
+	print("[MeshCollider] %s (%s): added %s with %d shape(s)%s"
+		% [model.name, source.get_file(), body.get_class(), Collider.count_shapes(body),
+		" [已编组]" if grouping else ""])
 	return true