app: make prepare proposal more robust to comet misconfiguration #4664
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Describe your changes
This PR adds a tx size check in the proposal preparation logic so that the application always build valid blocks even in the even of a cometbft misconfiguration.
Checklist before requesting a review
If this code contains consensus-breaking changes, I have added the "consensus-breaking" label. Otherwise, I declare my belief that there are not consensus-breaking changes, for the following reason: