bug#42578: 28.0.50; [suggestion] allow dired-do-shell-command on directory line

[Drew Adams <drew.adams@oracle.com>]

All that you suggest is fine to suggest, IMO.
I didn't mean to discourage such suggestion.

It's true that a dir heading has few associated
actions, by default.  (Movement among such headings
is about the only such action, I think, by default.)

It's also true that to act on a dir/subdir you
generally need to be on its `.' line.  Or else (for
some other commands) it doesn't matter where, within
its listing, you are.

I personally don't have a problem with the default
behavior of `M-<' or `C-<home' moving to the
beginning of the buffer (as in other buffers).  But
if you think a better default behavior would be to
move to its `.' line, then suggest that.  (Vanilla
Emacs also doesn't allow most actions on `.', but
that's a different problem/story.)

In that case, you'd probably want dir navigation
keys (`C-M-n' etc.) to also move to the `.' line
of a dir listing, and not to the heading line.

In a way, a dir heading line and its `.' line
both represent the same thing.  One shows the dir
name (absolute), and the other shows the attributes
(permissions, date, size etc.).

I also agree that there's room for further enhancing
Dired.  In particular, some of the commands that act
by default relative to the top-most directory listed
(e.g. `find-name-dired') could instead act by default
on the subdir of the listing where point is.

E.g., `M-x find-name-dired' could use, as default,
the subdir of the current listing (wrt point).

Whether such a change would be for the better, I
don't know.  But it's possible, and maybe worth
thinking about.  One thing you might do is code such
changes for your own use (e.g. a mini-library), and
try it for a while.

So far, dir headings are just that: they serve only
to identify a particular listing within the buffer,
and they serve as movement destinations, when moving
among such listings.

(Dired+, unlike vanilla Emacs, allows some actions
on `.' and `..'.  But it too doesn't bother to do
so on a heading line.  IOW, it doesn't treat a
heading line the same as the `.' line.)