fix: grants by granter pagination `total` (#11813)

## Description

Closes: #11812 



---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

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

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

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)

CHANGELOG.md

@@ -266,6 +266,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (cli) [\#11337](https://github.com/cosmos/cosmos-sdk/pull/11337) Fixes `show-adress` cli cmd
 * (crypto) [\#11298](https://github.com/cosmos/cosmos-sdk/pull/11298) Fix cgo secp signature verification and update libscep256k1 library.
 * (x/authz) [\#11512](https://github.com/cosmos/cosmos-sdk/pull/11512) Fix response of a panic to error, when subtracting balances.
+* (x/feegrant) [\#11813](https://github.com/cosmos/cosmos-sdk/pull/11813) Fix pagination total count in `AllowancesByGranter` query.
 
 ### State Machine Breaking
 

x/feegrant/keeper/grpc_query.go

@@ -111,21 +111,22 @@ func (q Keeper) AllowancesByGranter(c context.Context, req *feegrant.QueryAllowa
 
 	store := ctx.KVStore(q.storeKey)
 	prefixStore := prefix.NewStore(store, feegrant.FeeAllowanceKeyPrefix)
-	pageRes, err := query.Paginate(prefixStore, req.Pagination, func(key []byte, value []byte) error {
-		var grant feegrant.Grant
-
+	pageRes, err := query.FilteredPaginate(prefixStore, req.Pagination, func(key []byte, value []byte, accumulate bool) (bool, error) {
 		// ParseAddressesFromFeeAllowanceKey expects the full key including the prefix.
 		granter, _ := feegrant.ParseAddressesFromFeeAllowanceKey(append(feegrant.FeeAllowanceKeyPrefix, key...))
 		if !granter.Equals(granterAddr) {
-			return nil
+			return false, nil
 		}
 
-		if err := q.cdc.Unmarshal(value, &grant); err != nil {
-			return err
+		if accumulate {
+			var grant feegrant.Grant
+			if err := q.cdc.Unmarshal(value, &grant); err != nil {
+				return false, err
+			}
+			grants = append(grants, &grant)
 		}
 
-		grants = append(grants, &grant)
-		return nil
+		return true, nil
 	})
 
 	if err != nil {

x/feegrant/keeper/grpc_query_test.go

@@ -59,7 +59,7 @@ func (suite *KeeperTestSuite) TestFeeAllowance() {
 			},
 			false,
 			func() {
-				grantFeeAllowance(suite)
+				suite.grantFeeAllowance(suite.addrs[0], suite.addrs[1])
 			},
 			func(response *feegrant.QueryAllowanceResponse) {
 				suite.Require().Equal(response.Allowance.Granter, suite.addrs[0].String())
@@ -124,7 +124,7 @@ func (suite *KeeperTestSuite) TestFeeAllowances() {
 			},
 			false,
 			func() {
-				grantFeeAllowance(suite)
+				suite.grantFeeAllowance(suite.addrs[0], suite.addrs[1])
 			},
 			func(resp *feegrant.QueryAllowancesResponse) {
 				suite.Require().Equal(len(resp.Allowances), 1)
@@ -190,12 +190,16 @@ func (suite *KeeperTestSuite) TestFeeAllowancesByGranter() {
 			},
 			false,
 			func() {
-				grantFeeAllowance(suite)
+				suite.grantFeeAllowance(suite.addrs[0], suite.addrs[1])
+
+				// adding this allowance to check whether the pagination working fine.
+				suite.grantFeeAllowance(suite.addrs[1], suite.addrs[2])
 			},
 			func(resp *feegrant.QueryAllowancesByGranterResponse) {
 				suite.Require().Equal(len(resp.Allowances), 1)
 				suite.Require().Equal(resp.Allowances[0].Granter, suite.addrs[0].String())
 				suite.Require().Equal(resp.Allowances[0].Grantee, suite.addrs[1].String())
+				suite.Require().Equal(resp.Pagination.Total, uint64(1))
 			},
 		},
 	}
@@ -214,9 +218,9 @@ func (suite *KeeperTestSuite) TestFeeAllowancesByGranter() {
 	}
 }
 
-func grantFeeAllowance(suite *KeeperTestSuite) {
+func (suite *KeeperTestSuite) grantFeeAllowance(granter, grantee sdk.AccAddress) {
 	exp := suite.sdkCtx.BlockTime().AddDate(1, 0, 0)
-	err := suite.app.FeeGrantKeeper.GrantAllowance(suite.sdkCtx, suite.addrs[0], suite.addrs[1], &feegrant.BasicAllowance{
+	err := suite.app.FeeGrantKeeper.GrantAllowance(suite.sdkCtx, granter, grantee, &feegrant.BasicAllowance{
 		SpendLimit: sdk.NewCoins(sdk.NewInt64Coin("atom", 555)),
 		Expiration: &exp,
 	})