libobs: Actually fix ungroup deadlock

66c27c2ceaa65 (#4664) was mistakenly merged. It was also the incorrect
way to fix the deadlock. Because duplicate_item_data() already defers
the texture creation process, we can just add a param to
obs_scene_add_internal() which allows us to exclude the creation of the
item texture for this specific case. The texture will then automatically
be created later before it's used. There was no reason to be creating
the texture there, as it was unnecessary.

Properly fixes obsproject/obs-studio#3166

libobs/obs-scene.c

@@ -1811,7 +1811,8 @@ static inline bool source_has_audio(obs_source_t *source)
 
 static obs_sceneitem_t *obs_scene_add_internal(obs_scene_t *scene,
 					       obs_source_t *source,
-					       obs_sceneitem_t *insert_after)
+					       obs_sceneitem_t *insert_after,
+					       bool create_texture)
 {
 	struct obs_scene_item *last;
 	struct obs_scene_item *item;
@@ -1866,7 +1867,7 @@ static obs_sceneitem_t *obs_scene_add_internal(obs_scene_t *scene,
 		item->visible = true;
 	}
 
-	if (item_texture_enabled(item)) {
+	if (create_texture && item_texture_enabled(item)) {
 		obs_enter_graphics();
 		item->item_render = gs_texrender_create(GS_RGBA, GS_ZS_NONE);
 		obs_leave_graphics();
@@ -1907,7 +1908,8 @@ static obs_sceneitem_t *obs_scene_add_internal(obs_scene_t *scene,
 
 obs_sceneitem_t *obs_scene_add(obs_scene_t *scene, obs_source_t *source)
 {
-	obs_sceneitem_t *item = obs_scene_add_internal(scene, source, NULL);
+	obs_sceneitem_t *item =
+		obs_scene_add_internal(scene, source, NULL, true);
 	struct calldata params;
 	uint8_t stack[128];
 
@@ -2990,8 +2992,8 @@ obs_sceneitem_t *obs_scene_insert_group(obs_scene_t *scene, const char *name,
 	obs_scene_t *sub_scene = create_id("group", name);
 	obs_sceneitem_t *last_item = items ? items[count - 1] : NULL;
 
-	obs_sceneitem_t *item =
-		obs_scene_add_internal(scene, sub_scene->source, last_item);
+	obs_sceneitem_t *item = obs_scene_add_internal(scene, sub_scene->source,
+						       last_item, true);
 
 	obs_scene_release(sub_scene);
 
@@ -3102,7 +3104,8 @@ void obs_sceneitem_group_ungroup(obs_sceneitem_t *item)
 		obs_sceneitem_t *dst;
 
 		remove_group_transform(item, last);
-		dst = obs_scene_add_internal(scene, last->source, insert_after);
+		dst = obs_scene_add_internal(scene, last->source, insert_after,
+					     false);
 		duplicate_item_data(dst, last, true, true, true);
 		apply_group_transform(last, item);