[Bug 41700] "Install Now" and "Customize installation" buttons are invisible in Python 3.5 installer

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41700

--- Comment #8 from Dmitry Timoshkov <dmitry at baikal.ru> ---
(In reply to Dmitry Timoshkov from comment #7)
> (In reply to Alex Henrie from comment #5)
> > Created attachment 56119 [details]
> > Windows XP screenshot
> > 
> > (In reply to Dmitry Timoshkov from comment #3)
> > > Actually Python 3.5 installer should work under XP too
> > 
> > The attached screenshot shows that it does not. Wine's Windows XP behavior
> > is correct.
> 
> It looks like the supported Windows version requirements have changed
> starting from the Python 3.5.1 release. I've attached a screenshot of
> Python 3.5.0 installer startup screen running under XP, it matches
> the Wine one.
> 
> If I recall correctly since when I looked at this problem last time
> the source of the problem is that the Python installer (or rather WIX)
> uses invalid style for the "Button" window class which leads to a failure
> in repainting the window.

Probably WIX depends on another quirk between user32 and comctl32 in
the "Button" class implementations. See for another example of a similar
painting issue bug 29921, it has a test case with source attached.

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