bug#41097: 28.0.50; (dired-toggle-marks) not working after copy

[Jean Louis <bugs@gnu.support>]

* Tomas Nordin <tomasn@posteo.net> [2020-05-10 12:25]:
> > Problem is explained, after copy of marked files in the neighboring
> > window, the key `t' for `dired-toggle-marks' don't work, as `t' is not
> > marking those files in the neighboring window.
> >
> > I have to kill the window and enter directory again to be able to mark
> > the files with `t'
> 
> You could also try to hit `U' at this point instead of killing window
> and enter directory again, to run dired-unmark-all-marks. After that the
> toggling should do what you expect.

Aaa, that it is.

So C flag is mark same as with t, that is good for me.

But that behavior is not described that I know. If that is intended to
be so, that marking and flagging is the same, then maybe description
should be changed for that function, that user knows that function
will not work if files have the flag C for being copied.

Toggle marks: marked files become unmarked, and vice versa.
Files marked with other flags (such as ‘D’) are not affected.
‘.’ and ‘..’ are never toggled.
As always, hidden subdirs are not affected.