What windows are "popup windows"?

[John Found]

On Wed, 18 Nov 2015 10:47:28 +0100
Olivier Fourdan <fourdan at gmail.com> wrote:

> Perfectly normal, if you use ARGB windows, xfwm4 compositor won't apply
> shadows to your window because it doesn "know" the actual shape of the
> content (being ARGB).
> 

Oh, I see. But actually the compositor knows the shape - it is the alpha channel.

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John Found <johnfound at asm32.info>