bug#56662: 29.0.50; Funny region highlights when highlight-nonselected-windows is t

[Visuwesh]

[வியாழன் ஜூலை 21, 2022] Eli Zaretskii wrote:

>> > But that's a bug: region highlighting should definitely work in a
>> > selected window.
>>
>> It won't be a bug if the region is considered window-local.
>
> That's what the default already does, doesn't it?
>

No?  If I deactivate the mark in window A, it deactivates the mark in
window B too.