bug#2421: 23.0.90; python-mode: Indent commands behavior

[martin rudalics]

>     mr> I don't know whether `python-shift-left' and
>     mr> `python-shift-right' are of any use without a prefix argument.
>
> They are, I often use them after adding or removing a statement in a
> code.

I'm confused.  Why don't you use TAB in that case?

>     mr> With a prefix argument, they are simple wrappers for
>     mr> `indent-rigidly'.
>
> Yes, this makes no sense.  It would be more logical if they indented by
> (* python-indent count).

It might be even more logical to restrict ourselves to valid indentation
points only.  In any case we would need some feedback from `python-mode'
users for such a change.  The same goes for not deactivating the mark.

>     mr> In any case, it might be better to use `use-region-p' instead of
>     mr> `mark-active' to be more consistent with Emacs 23.
>
> But then the indent commands would work only if transient-mark-mode was
> enabled, wouldn't they?

The commands should DTRT when `transient-mark-mode' is enabled because
it's the default with Emacs 23.  That is, with `transient-mark-mode' on,
these commands should operate on the region only if the mark is active
and should respect `use-empty-active-region'.  I have no idea what TRT
is now when `transient-mark-mode' is off.  You appear reluctant to use
transient mark mode, I suppose ...

martin