Fix inset box shadows with blur radius. #902
Merged
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The geometry rects being sent for inset box shadows on the
blur path were incorrect.
The test coverage we have enabled in WPT/CSS only exercises the
inset fast path (where the blur radius is zero). Added a reftest
that just ensures inset box shadows at least draw something - this
is not ideal, but we don't have any proper infrastructure for
reftesting blurs right now. Also confirmed that the reftest fails
without this commit.
Fixes #893.
This change is