fix: exporting the blockParams regression (backport cosmos#13029) (cosmos#13037)

* fix: exporting the blockParams regression (cosmos#13029)

## Description

Closes: cosmos#13024

---

### Author Checklist

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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
- [x] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

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I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

(cherry picked from commit e1999e4)

# Conflicts:
#	CHANGELOG.md
#	server/export_test.go

* fix conflicts

Co-authored-by: JayT106 <JayT106@users.noreply.github.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

Author: 3 people

CHANGELOG.md

@@ -37,6 +37,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+### Bug Fixes
+
+* (export) [#13029](https://github.com/cosmos/cosmos-sdk/pull/13029) Fix exporting the blockParams regression.
+
 ## [v0.46.1](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.46.1) - 2022-08-24
 
 ### Improvements

server/export.go

@@ -82,8 +82,9 @@ func ExportCmd(appExporter types.AppExporter, defaultNodeHome string) *cobra.Com
 			doc.InitialHeight = exported.Height
 			doc.ConsensusParams = &tmproto.ConsensusParams{
 				Block: tmproto.BlockParams{
-					MaxBytes: exported.ConsensusParams.Block.MaxBytes,
-					MaxGas:   exported.ConsensusParams.Block.MaxGas,
+					MaxBytes:   exported.ConsensusParams.Block.MaxBytes,
+					MaxGas:     exported.ConsensusParams.Block.MaxGas,
+					TimeIotaMs: doc.ConsensusParams.Block.TimeIotaMs,
 				},
 				Evidence: tmproto.EvidenceParams{
 					MaxAgeNumBlocks: exported.ConsensusParams.Evidence.MaxAgeNumBlocks,
@@ -104,6 +105,7 @@ func ExportCmd(appExporter types.AppExporter, defaultNodeHome string) *cobra.Com
 			}
 
 			cmd.SetOut(cmd.OutOrStdout())
+			cmd.SetErr(cmd.OutOrStderr())
 			cmd.Println(string(sdk.MustSortJSON(encoded)))
 			return nil
 		},

server/export_test.go

@@ -31,7 +31,7 @@ import (
 func TestExportCmd_ConsensusParams(t *testing.T) {
 	tempDir := t.TempDir()
 
-	_, ctx, _, cmd := setupApp(t, tempDir)
+	_, ctx, genDoc, cmd := setupApp(t, tempDir)
 
 	output := &bytes.Buffer{}
 	cmd.SetOut(output)
@@ -46,6 +46,7 @@ func TestExportCmd_ConsensusParams(t *testing.T) {
 
 	require.Equal(t, simapp.DefaultConsensusParams.Block.MaxBytes, exportedGenDoc.ConsensusParams.Block.MaxBytes)
 	require.Equal(t, simapp.DefaultConsensusParams.Block.MaxGas, exportedGenDoc.ConsensusParams.Block.MaxGas)
+	require.Equal(t, genDoc.ConsensusParams.Block.TimeIotaMs, exportedGenDoc.ConsensusParams.Block.TimeIotaMs)
 
 	require.Equal(t, simapp.DefaultConsensusParams.Evidence.MaxAgeDuration, exportedGenDoc.ConsensusParams.Evidence.MaxAgeDuration)
 	require.Equal(t, simapp.DefaultConsensusParams.Evidence.MaxAgeNumBlocks, exportedGenDoc.ConsensusParams.Evidence.MaxAgeNumBlocks)