Async rendering for Svg widget #378
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This is pointless on its own
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Follow up on #376 adding async rendering for
Svg.Since the
usvg::Treetype is neitherSyncnorSend(see linebender/resvg#544), this re-parses the data each time the SVG is rendered (much faster than the render itself). The main drawback is that now we must retain access to the data somehow: here either by using a&'static [u8]or anArc<[u8]>.