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

[Jean Louis <bugs@gnu.support>]

* Michael Heerdegen <michael_heerdegen@web.de> [2020-05-09 03:26]:
> Jean Louis <bugs@gnu.support> writes:
> 
> > emacs -Q
> >
> > C-x C-f to /tmp directory
> > C-x 3 to make 2 windows vertical
> > in other directory, make new directory like /tmp/new
> > create file in /tmp or choose any file with m, marking it
> > use C to copy to /tmp/new
> > C-x o to other window where file is copied, it has C mark
> > press t to toggle, it is not working
> 
> Note that (docstring):
> 
>   "Files marked with other flags (such as ‘D’) are not affected."
> 
> You must unmark the copied files (the C mark) for toggling to have an
> effect on them.  Is that your problem?
> 
> Michael.

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'

Jean