Allow double-clicking icons of non-editable Tree items

Author: aaronfranke

editor/docks/scene_tree_dock.cpp

@@ -1292,7 +1292,7 @@ void SceneTreeDock::_tool_selected(int p_tool, bool p_confirm_override) {
 					bool editable = EditorNode::get_singleton()->get_edited_scene()->is_editable_instance(node);
 
 					if (editable) {
-						editable_instance_remove_dialog->set_text(TTR("Disabling \"editable_instance\" will cause all properties of the node to be reverted to their default."));
+						editable_instance_remove_dialog->set_text(TTR("Disabling \"Editable Children\" will cause all properties of this subscene's descendant nodes to be reverted to their default."));
 						editable_instance_remove_dialog->popup_centered();
 						break;
 					}

scene/gui/tree.cpp

@@ -4134,6 +4134,8 @@ void Tree::gui_input(const Ref<InputEvent> &p_event) {
 					if (rtl) {
 						pressing_pos.x = get_size().width - pressing_pos.x;
 					}
+				} else if (mb->is_double_click()) {
+					emit_signal(SNAME("item_icon_double_clicked"));
 				}
 
 				if (mb->get_button_index() == MouseButton::RIGHT) {