Add preview Sun and Environment

* Adds both a preview sun and preview environment to the 3D editor.
* They are valid as long as a DirectionalLight3D and WorldEnvironment are not in the scene.
* If any is added to the scene, the respective preview is disabled.
* Changed WorldEnvironment to better handle multiple node versions.
* Added a function in SceneTree to get the first node in a group.
* Fixed button minimum size to also consider font height if no text is there, this broke with the TextSever PR.

2 files changed, 17 insertions, 0 deletions

diff --git a/scene/main/scene_tree.cpp b/scene/main/scene_tree.cpp
index 9f32c65f7b..b10e23ac07 100644
--- a/scene/main/scene_tree.cpp
+++ b/scene/main/scene_tree.cpp
@@ -956,6 +956,21 @@ bool SceneTree::has_group(const StringName &p_identifier) const {
 	return group_map.has(p_identifier);
 }
 
+Node *SceneTree::get_first_node_in_group(const StringName &p_group) {
+	Map<StringName, Group>::Element *E = group_map.find(p_group);
+	if (!E) {
+		return nullptr; //no group
+	}
+
+	_update_group_order(E->get()); //update order just in case
+
+	if (E->get().nodes.size() == 0) {
+		return nullptr;
+	}
+
+	return E->get().nodes[0];
+}
+
 void SceneTree::get_nodes_in_group(const StringName &p_group, List<Node *> *p_list) {
 	Map<StringName, Group>::Element *E = group_map.find(p_group);
 	if (!E) {
@@ -1216,6 +1231,7 @@ void SceneTree::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_group", "group", "property", "value"), &SceneTree::set_group);
 
 	ClassDB::bind_method(D_METHOD("get_nodes_in_group", "group"), &SceneTree::_get_nodes_in_group);
+	ClassDB::bind_method(D_METHOD("get_first_node_in_group", "group"), &SceneTree::get_first_node_in_group);
 
 	ClassDB::bind_method(D_METHOD("set_current_scene", "child_node"), &SceneTree::set_current_scene);
 	ClassDB::bind_method(D_METHOD("get_current_scene"), &SceneTree::get_current_scene);
diff --git a/scene/main/scene_tree.h b/scene/main/scene_tree.h
index f39780831f..c2280c747b 100644
--- a/scene/main/scene_tree.h
+++ b/scene/main/scene_tree.h
@@ -302,6 +302,7 @@ public:
 	void queue_delete(Object *p_object);
 
 	void get_nodes_in_group(const StringName &p_group, List<Node *> *p_list);
+	Node *get_first_node_in_group(const StringName &p_group);
 	bool has_group(const StringName &p_identifier) const;
 
 	//void change_scene(const String& p_path);