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60d9ab7e7b
RenderBlock wasn't constraining the results. RenderPadding wasn't constraining the results (which matters especially when the constraints can't fit the padding in the first place). RenderViewport wasn't constraining the results. Add a test for the block case. To catch this kind of thing in the future, add some asserts to debugDoesMeetConstraints() that all four intrinsic functions return values that are within the constraints. RenderBlockViewport doesn't support returning intrinsics, so turn off the "no intrinsic support" asserts (and return zero) when we're doing this new assert. This new assert screwed up the custom layout classes' tests, so adjust those tests to ignore the callbacks invoked from these asserts. Add to the _debugReportException() method a short summary of the descendants of this node. It's important to have this information when debugging errors like these intrinsic constraints contract violations because often nodes just pass the values through to their child so you have to go several steps down to find the actual problem. Fixes https://github.com/flutter/flutter/issues/1210
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