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Reverts: flutter/flutter#148470 Initiated by: eyebrowsoffire Reason for reverting: Unit test failures closing the tree. Original PR Author: hello-coder-xu Reviewed By: {QuncCccccc, Piinks} This change reverts the following previous change: * sliverGridDelegate mainAxisExtent add assert,Avoid incorrect use * Fixes https://github.com/flutter/flutter/issues/138871