Some login dialogs are not styled correctly in Dark Mode

[khaykov]

“Continue with” screen on the email sign-in flow and “Choose an account” screen in the Google sign-in flow are not styled correctly in Dark Mode.

We need to investigate how much control we have over them and change their style to match Dark Theme if possible.

[renanferrari]

After some investigation, I unfortunately have not found a way of styling those dialogs with dark mode. Here's what I tried:

• Updating the Google Sign-In library. My assumption here was that this would be automatically handled by newer versions of the library, but it wasn't the case.
• Finding a way to customize the theme and styles used by the library. I thought maybe the theme used by the library was something we could override or maybe there would be some styling options hidden somewhere, but none of those were true.
• Figuring out if it was possible to retrieve the information displayed by the dialog (a list of Google accounts, for example) so we could display it in our own dialog instead, which was not possible as well.

After some benchmarking I realized other apps that use this library are facing the exact same issue, so at least it's not something our users would only see in our app. I think there's nothing we can do at the moment, unless waiting for a library update that would introduce an official way of handling this.