bug#46882: 26.3; Let `dired-omit-mode' match lines, as well as file names

[Drew Adams]

> > Its counterpart variable is `dired-omit-files' that is a regexp.
> > Shouldn't the new variable be named with the same naming scheme
> > for consistency?  I.e. just `dired-omit-lines'.  Even so that
> > it's not just a regexp, but can be a symbol of a function name.
                                                ^^^^^^^^^^^^^^^^^^
Ah, so you _didn't_ use the code I sent, which
supports a symbol as a _variable_, whose value
is a regexp.  Too bad.

And what kind of function are we talking about?
A function that returns a regexp?  A function
that does something else?

> Makes sense; now renamed.

Too bad.  Guess that changes this from "done"
to "won't fix".

Guess this is hidden behind your "I've now
pushed to Emacs 29 (with some changes)."
                    ^^^^^^^^^^^^^^^^^

Guess I'll have to keep the original option
`diredp-omit-lines-regexp' around.  I was
hoping Emacs would absorb it, so renaming
`diredp-' to `dired-' would suffice.

For your "consistency" maybe you'll now want
to change `dired-omit-files' to also support
a function symbol...  I mean, _consistency_,
right?

And while you're at it, for "consistency"
consider renaming `dired-garbage-files-regexp'.
Oh, and add support for it to be a function
symbol...  Consistency.

Consistency is a wonderful, hobgoblinny thing.