Correctly set up shortcut context in the shader editor

editor/plugins/shader_editor_plugin.cpp

@@ -609,6 +609,7 @@ ShaderEditorPlugin::ShaderEditorPlugin() {
 	vb->add_child(menu_hb);
 	file_menu = memnew(MenuButton);
 	file_menu->set_text(TTR("File"));
+	file_menu->set_shortcut_context(main_split);
 	file_menu->get_popup()->add_item(TTR("New Shader"), FILE_NEW);
 	file_menu->get_popup()->add_item(TTR("New Shader Include"), FILE_NEW_INCLUDE);
 	file_menu->get_popup()->add_separator();