-Properly keep animation editor and viewport state while switching scene tabs

tools/editor/editor_node.cpp

@@ -1765,6 +1765,7 @@ void EditorNode::_menu_option_confirm(int p_option,bool p_confirmed) {
 
 			int idx = editor_data.add_edited_scene(-1);
 			_scene_tab_changed(idx);
+			editor_data.clear_editor_states();
 
 			//_cleanup_scene();
 

tools/editor/plugins/animation_player_editor_plugin.cpp

@@ -549,6 +549,49 @@ void AnimationPlayerEditor::ensure_visibility() {
 	_animation_edit();
 }
 
+Dictionary AnimationPlayerEditor::get_state() const {
+
+	Dictionary d;
+
+	d["visible"]=is_visible();
+	if (is_visible() && player) {
+		d["player"]=EditorNode::get_singleton()->get_edited_scene()->get_path_to(player);
+		d["animation"]=player->get_current_animation();
+		d["editing"]=edit_anim->is_pressed();
+	}
+
+	return d;
+
+}
+void AnimationPlayerEditor::set_state(const Dictionary& p_state) {
+
+	if (p_state.has("visible") && p_state["visible"]) {
+
+		Node *n = EditorNode::get_singleton()->get_edited_scene()->get_node(p_state["player"]);
+		if (n && n->cast_to<AnimationPlayer>()) {
+			player=n->cast_to<AnimationPlayer>();
+			_update_player();
+			show();
+			set_process(true);
+			ensure_visibility();
+			EditorNode::get_singleton()->animation_panel_make_visible(true);
+
+			if (p_state.has("animation")) {
+				String anim = p_state["animation"];
+				_select_anim_by_name(anim);
+				if (p_state.has("editing") && p_state["editing"]) {
+
+					edit_anim->set_pressed(true);
+					_animation_edit();
+				}
+			}
+
+		}
+	}
+
+}
+
+
 void AnimationPlayerEditor::_animation_resource_edit() {
 
 	if (animation->get_item_count()) {

tools/editor/plugins/animation_player_editor_plugin.h

@@ -151,6 +151,10 @@ protected:
 	static void _bind_methods();
 public:
 
+	Dictionary get_state() const;
+	void set_state(const Dictionary& p_state);
+
+
 	void ensure_visibility();
 
 	void set_undo_redo(UndoRedo *p_undo_redo) { undo_redo=p_undo_redo; }
@@ -167,6 +171,9 @@ class AnimationPlayerEditorPlugin : public EditorPlugin {
 
 public:
 
+	virtual Dictionary get_state() const { return anim_editor->get_state(); }
+	virtual void set_state(const Dictionary& p_state)  { anim_editor->set_state(p_state); }
+
 	virtual String get_name() const { return "Anim"; }
 	bool has_main_screen() const { return false; }
 	virtual void edit(Object *p_node);

tools/editor/plugins/spatial_editor_plugin.cpp

@@ -2168,7 +2168,18 @@ void SpatialEditorViewport::set_state(const Dictionary& p_state) {
 		view_menu->get_popup()->set_item_checked( idx, listener );
 	}
 
-
+	if (p_state.has("previewing")) {
+		Node *pv = EditorNode::get_singleton()->get_edited_scene()->get_node(p_state["previewing"]);
+		if (pv && pv->cast_to<Camera>()) {
+			previewing=pv->cast_to<Camera>();
+			previewing->connect("exit_tree",this,"_preview_exited_scene");
+			VS::get_singleton()->viewport_attach_camera( viewport->get_viewport(), previewing->get_camera() ); //replace
+			view_menu->hide();
+			surface->update();
+			preview_camera->set_pressed(true);
+			preview_camera->show();
+		}
+	}
 }
 
 Dictionary SpatialEditorViewport::get_state() const {
@@ -2181,6 +2192,10 @@ Dictionary SpatialEditorViewport::get_state() const {
 	d["use_environment"]=camera->get_environment().is_valid();
 	d["use_orthogonal"]=camera->get_projection()==Camera::PROJECTION_ORTHOGONAL;
 	d["listener"]=viewport->is_audio_listener();
+	if (previewing) {
+		d["previewing"]=EditorNode::get_singleton()->get_edited_scene()->get_path_to(previewing);
+	}
+
 	return d;
 }