* [#15581](https://github.com/cosmos/cosmos-sdk/pull/15581) `GetSignersOptions` and `directaux.SignModeHandlerOptions` now
require a `signing.ProtoFileResolver` interface instead of `protodesc.Resolver`.
* [#13793](https://github.com/cosmos/cosmos-sdk/pull/13793) `direct_aux.NewSignModeHandler` constructor function now returns an additional error argument.
* [#15278](https://github.com/cosmos/cosmos-sdk/pull/15278) Move `x/tx/{textual,aminojson}` into `x/tx/signing`.
* [#15302](https://github.com/cosmos/cosmos-sdk/pull/15302) `textual.NewSignModeHandler` now takes an options struct instead of a simple coin querier argument. It also returns an error.
* [#15302](https://github.com/cosmos/cosmos-sdk/pull/15302) Add support for a custom registry (e.g. gogo's MergedRegistry) to be plugged into SIGN_MODE_TEXTUAL.
* [#15557](https://github.com/cosmos/cosmos-sdk/pull/15557) Implement unknown field filtering.
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