bug#22829: Acknowledgement (25.1.50; Display number of marked files)

[Juri Linkov]

> If we modify `dired-get-marked-files' as in the Bug#22892
> we can get in a  straightforward way the file sizes from the file system.
> I include the modified version of your code after these comments.

I still doubt if old code could be of any help.  When using file-attributes
instead of parsing the ls output in the dired buffer it would be easier
for you to implement new code from scratch with much shorter result.

Some parts of old code (to parse the dired buffer) would be useful
only in case if you decide to implement displaying recursive
directory sizes in-line as was requested yesterday in
http://emacs.stackexchange.com/questions/20766/display-recursive-folder-sizes-in-line-in-dired