Mail: Add fullscreen option

Author: https://github.com/hughdavenport
Commit: 4aca883d51
Pull-request: https://github.com/SerenityOS/serenity/pull/22591
Reviewed-by: https://github.com/ADKaster ✅

Userland/Applications/Mail/main.cpp

@@ -53,6 +53,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         app->quit();
     }));
 
+    auto view_menu = window->add_menu("&View"_string);
+    view_menu->add_action(GUI::CommonActions::make_fullscreen_action([&](auto&) {
+        window->set_fullscreen(!window->is_fullscreen());
+    }));
+
     auto help_menu = window->add_menu("&Help"_string);
     help_menu->add_action(GUI::CommonActions::make_command_palette_action(window));
     help_menu->add_action(GUI::CommonActions::make_about_action("Mail"_string, app_icon, window));