Add missing RTL styles for MainScreenButton

editor/themes/editor_theme_manager.cpp

@@ -1817,9 +1817,13 @@ void EditorThemeManager::_populate_editor_styles(const Ref<EditorTheme> &p_theme
 			main_screen_button_hover->set_content_margin((Side)i, p_config.button_style_hover->get_content_margin((Side)i));
 		}
 		p_theme->set_stylebox(CoreStringName(normal), "MainScreenButton", menu_transparent_style);
+		p_theme->set_stylebox("normal_mirrored", "MainScreenButton", menu_transparent_style);
 		p_theme->set_stylebox(SceneStringName(pressed), "MainScreenButton", menu_transparent_style);
+		p_theme->set_stylebox("pressed_mirrored", "MainScreenButton", menu_transparent_style);
 		p_theme->set_stylebox("hover", "MainScreenButton", main_screen_button_hover);
+		p_theme->set_stylebox("hover_mirrored", "MainScreenButton", main_screen_button_hover);
 		p_theme->set_stylebox("hover_pressed", "MainScreenButton", main_screen_button_hover);
+		p_theme->set_stylebox("hover_pressed_mirrored", "MainScreenButton", main_screen_button_hover);
 
 		p_theme->set_type_variation("MainMenuBar", "FlatMenuButton");
 		p_theme->set_stylebox(CoreStringName(normal), "MainMenuBar", menu_transparent_style);