[Interest] Blur part of rectangle possible?

[Josh Faust]

>
> That could probably work if i want to blur an image.
>  In this case i want to blur the bottom part of a ListView where i want
> to overlay a search field and blur the background.
> That case makes splitting it a bit difficult ;)
>

You can use sourceRect on ShaderEffectSource, and then apply the blur to
that ShaderEffectSource. This will end up drawing the ListView twice, which
may or may not be OK.
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