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28643e2cf4
New asserts: - verify that after layout, the size fits the constraints - verify that after layout, the size isn't infinite - verify that you don't set the size in performLayout() if you have sizedByParent set - verify that nobody reads your size during layout except you, or your parent if they said parentUsesSize:true Fixes some bugs found by those asserts: - RenderBlock, RenderStack, and RenderScaffold were not always setting parentUsesSize correctly - RenderScaffold was setting its slot entries to null rather than removing them when the slot went away, which led to null derefs in certain circumstances Also, rename a local variable in RenderStack.performLayout() because it was shadowing a variable on the object itself, which was really confusing when I first tried to debug this function... R=abarth@chromium.org Review URL: https://codereview.chromium.org/1213473003.
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