[PATCH] hgk: use Ttk instead of plain Tk

[Matt Mackall]

On Wed, 2012-11-07 at 19:19 +0100, Andrew Shadura wrote:
> Hello,
> 
> On Wed, 07 Nov 2012 19:13:33 +0100
> Mads Kiilerich <mads at kiilerich.com> wrote:
> 
> > > Use Ttk for most of the widgets. Default to xpnative theme on
> > > Windows, clam otherwise.
> 
> > What is Ttk? Is it available on all Tk installations? Or how widely 
> > available is it? Did it ship with Python 2.4 which Mercurial still
> > supports?
> 
> Ttk is available on all Tk >=8.5 installations, and is available as an
> add-on for Tk 8.4. As Tk 8.4 is EOLed already, and 8.5 is available
> pretty everywhere (and 8.6 is about to be released), it doesn't make any
> sense to not use it.

You've given us no hint what a 'ttk' is yet or why we'd want it. I see
it's 'themable widgets' - that's probably a good thing.

But let me rephrase Mads' question more directly: what about users who
are trying to run Mercurial on the most decrepit-but-still-widely-used
RHEL releases? Will they have to update Tk too? This matters because
they're the group most likely to be dependent on hgk.

Unfortunately, it looks like this is a problem. Tk 8.5 was released in
late 2007, but RHEL 5 was released in early 2007, so they're still on Tk
8.4. We have lots of RHEL 5 users; having their hgk stop working when
they try to upgrade hg is not ok.

(Yes, we're really this conservative about dependencies.)

If you could arrange for hgk to use ttk only if available, this might be
doable.

-- 
Mathematics is the supreme nostalgia of our time.