fix(types/mempool): fix slice init length (backport #21494) (#21519)

Co-authored-by: dropbigfish <[email protected]>
Co-authored-by: Julien Robert <[email protected]>

CHANGELOG.md

@@ -48,6 +48,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (types/mempool) [#21494](https://github.com/cosmos/cosmos-sdk/pull/21494) `GetSigners` function in priority nonce mempool returns an slide of the correct length.
 * (x/consensus) [#21493](https://github.com/cosmos/cosmos-sdk/pull/21493) Fix regression that prevented to upgrade to > v0.50.7 without consensus version params.
 * (baseapp) [#21256](https://github.com/cosmos/cosmos-sdk/pull/21256) Halt height will not commit the block indicated, meaning that if halt-height is set to 10, only blocks until 9 (included) will be committed. This is to go back to the original behavior before a change was introduced in v0.50.0.
 * (baseapp) [#21444](https://github.com/cosmos/cosmos-sdk/pull/21444) Follow-up, Return PreBlocker events in FinalizeBlockResponse.

types/mempool/priority_nonce_test.go

@@ -72,7 +72,7 @@ func (a signerExtractionAdapter) GetSigners(tx sdk.Tx) ([]mempool.SignerData, er
 	if err != nil {
 		return nil, err
 	}
-	signerData := make([]mempool.SignerData, len(sigs))
+	signerData := make([]mempool.SignerData, 0, len(sigs))
 	for _, sig := range sigs {
 		signerData = append(signerData, mempool.SignerData{
 			Signer:   sig.PubKey.Address().Bytes(),