[Development] Qt 'minimal' platform no rendering alpha/opacity.

[Paul Knopf]

I am testing the 'minimal' platform (mine is based off of it), and it seems
that is doesn't render the alpha channel (setting opacity).

Here is a gist <https://gist.github.com/anonymous/544e84fbcde5022a6878> of
my main function testing the opacity.

The saved images seems to have a tan background and no transparency.

Any ideas on how to get the alpha channel represented in the platform
backing store?

-- 
Thanks!

~Paul
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