bug#55234: 28.1; replace-string in rectangle regio

[Juri Linkov]

>> Wouldn't it go to infinite recursion when the advice on
>> region-beginning will call region-bounds that calls
>> rectangle--extract-region again?
>
> I must admit that I haven't checked when which calls are made (and there
> are a lot).  But I would expect that a binding to avoid the infinite
> recursion would be made in the advice itself, not outside.

The advice needs to get rectangular region boundaries
using rectangle--extract-region.