cd125e1f71
* Add test for RenderProxyBoxMixin; clarify doc, resolve TODO The TODO comment suggested this mixin would no longer be needed once a Dart issue on inherited constructors was fixed: https://github.com/dart-lang/sdk/issues/31543 That issue is now long since fixed, so I went to go carry out the TODO. But in doing so, I realized that the mixin's documentation was more right than the TODO comment: even with that issue fixed, there is a legitimate use case for this mixin, namely to reuse the implementation of RenderProxyBox in a class that also inherits from some other base class. Moreover, searching GitHub I found an example of a library that makes real use of that capability. So I think the right resolution is to accept that this separation is useful and delete the TODO. Then, add a test with an extremely simplified sketch of that real-world example. In case someone in the future attempts to simplify this mixin away, the test will point us at the use case that would be broken by such a change. Also remove the only in-tree use of the mixin, which was redundant; and expand the mixin's documentation to advise about that case. * Tweak formatting Co-authored-by: Michael Goderbauer <goderbauer@google.com> * Cut comments --------- Co-authored-by: Michael Goderbauer <goderbauer@google.com>
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