International in Country Switcher

First, quick attempt but it seems to work for me now. Could you take a look before I create a MR?

Yes, this could be added to the block configuration.

I also see a CountryChangeEvent in your branch. This probably would not make it into the module. The idea is that the current country is set very early during the request (see CountryEventSubscriber) and then is immutable. If you have sound reasoning for this, please describe the use case.

Yes, I actually added that too because I created it in the meantime but feel free to pick.

My actual use case is to issue a redirect to a specific page when the user changes the country (practically to go to the starting page of that country rather than staying on the same page but with a different country setting. I use a correct middleware redirect approach so it doesn't get executed immediately but gets stored in the kernel and is executed when the current request actually finishes.

But, actually, I can achieve the same effect with using a different Country Switcher, a modified copy of yours that creates the URLs according to my specific needs. And this probably is a cleaner approach, anyway.

The first approach sounds wrong. The CountryChangeEvent would fire on every request regardless of the user action. As you mentioned, I think it is better to change the block. You can extend the existing block or maybe even use hook_block_build_BASE_BLOCK_ID_alter (I haven't tried the hook).

Can you please open a "clean" merge request with the changes regarding the International option?

I was hoping for a git revert to function but it doesn't. :-) I'll start all over again.

I hope I didn't screw up, I'm much less familiar with this Drupal Git than with GitHub. :-))