Flutter icons on Wayland

Flutter apps on Wayland have had an issue for some time where they don't show their icons in the window decorations, task switchers, and Overview-type effects. This is because the app's window isn't correctly associated with the app's .desktop file.

I contributed a fix that has been merged to resolve this for newly created projects in the future.

It can be applied to existing projects like so:

Add g_set_prgname to the function at the end of the linux/my_application.cc file:

MyApplication* my_application_new() {
  g_set_prgname(APPLICATION_ID);

  return MY_APPLICATION(g_object_new(my_application_get_type(),
                                     "application-id", APPLICATION_ID,
                                     "flags", G_APPLICATION_NON_UNIQUE,
                                     nullptr));
}

Also ensure that in the linux/CMakeLists.txt file, the line set(APPLICATION_ID "<your_app_id>") is set to your desired application ID (often the reverse domain name of your app, e.g. com.example.myapp).

Now if the app's .desktop and icon files are named the same as the application ID, the app's window should be correctly associated and the icons should show up correctly. (e.g. com.example.myapp.desktop and com.example.myapp.svg)

tip

If the same sort of issue is happening for Qt apps, you can use the QGuiApplication::setDesktopFileName function to similarly associate the app's window with its .desktop file.