selectrum-read-directory-name problems

[clemera]

To make it more convenient to select the current directory selectrum-read-directory-name changes the default-filename passed to read-file-name-default. This changes the result value in some cases: When you submit the prompt you get this default value as a result which is unexpected.

Another problem is that currently the sorting of the current directory to the top has stopped working because it still assumes directories have trailing slashes while these are now shown with overlays again.

Maybe instead of overriding read-directory-name we could initially select the prompt when reading directory names. This approach would keep the convenience that one can just press RET for the current directory while avoiding any incompatible behaviour changes.