bug#39902: 28.0.50; Marking in dired with active region

[Drew Adams]

Hi Michael,

Just so I can understand better, what's the 
reason you prefer to use the keyboard to
establish an active region that  selects the
lines you want to mark, and then invoke a
command to mark the lines captured by the
region, rather than just using `m' (e.g.
with a prefix arg)?

E.g., Rather than `C-SPC', navigate to the
desired region-end position, and then `m',
why not just use a prefix arg with `m'?

A guess is that you might use something like
`M->' to go to the region-end position.  But
even then, a large prefix arg should do the
job: `C-u 99999 m' versus `C-SPC M-> m'.

Could you give a recipe/example of your use
of keyboard keys for this, or otherwise
explain the rationale for it?

(NB: I'm not arguing that this bug should
not be fixed.  And as mentioned, the fix
should be trivial.)

In Dired+, though I define command
`diredp-mark-region-files' (which, as has
been pointed out, DTRT wrt this bug), I
don't bind it to a key, by default.

I haven't thought such a binding would be
very useful, which is why I ask for an
example use case.

Instead, I just provide mouse and menu
bindings for it when the region's active:
`S-mouse-1', `Mark Region' in a menu-bar
menu, and `Mark' in a `mouse-3' popup menu.

Similarly, for region commands to unmark,
flag, and toggle marks:
`diredp-unmark-region-files',
`diredp-flag-region-files-for-deletion',
`diredp-toggle-marks-in-region'.