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If your constraints are tight when you get laid out, you don't get a relayout subtree root. If you don't have a relayout subtree root, and you get marked dirty, you go through layoutWithoutResize() rather than layout(), so we don't get a parentUsesSize. If you're not dirty and your constraints didn't change, layout() skips your layout. So then if your initial layout had parentUsesSize:true, and then you got marked dirty directly, you would set your size with parentCanUseSize=false, and then later if your parent tried to lay you out then read your size, it would crash because your size wasn't set up to allow you to get your size. The fix is to actually remember the last setting of parentUsesSize, even in the case of the constraints being tight and you later being marked as needing layout directly.
Sky
Sky is a new way to build high performance, cross platform mobile apps. More specifically, Sky is a rendering engine, a scripting engine, an (optional) framework, and a (optional) set of Material Design widgets. Sky is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input, high frame rates, and we are purely mobile first.
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For information about using Sky to build apps, please see Getting started with Sky.
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For information about contributing to Sky, please see CONTRIBUTING.md.