fix(cheatcodes): record state diff only if balance changed (#9658)

Author: grandizzy

crates/cheatcodes/src/evm.rs

@@ -1149,15 +1149,15 @@ fn get_recorded_state_diffs(state: &mut Cheatcodes) -> BTreeMap<Address, Account
                     account_access.oldBalance != account_access.newBalance
             })
             .for_each(|account_access| {
-                let account_diff = state_diffs.entry(account_access.account).or_insert_with(|| {
-                    AccountStateDiffs {
-                        label: state.labels.get(&account_access.account).cloned(),
-                        ..Default::default()
-                    }
-                });
-
                 // Record account balance diffs.
                 if account_access.oldBalance != account_access.newBalance {
+                    let account_diff =
+                        state_diffs.entry(account_access.account).or_insert_with(|| {
+                            AccountStateDiffs {
+                                label: state.labels.get(&account_access.account).cloned(),
+                                ..Default::default()
+                            }
+                        });
                     // Update balance diff. Do not overwrite the initial balance if already set.
                     if let Some(diff) = &mut account_diff.balance_diff {
                         diff.new_value = account_access.newBalance;

testdata/default/repros/Issue9643.t.sol

@@ -42,7 +42,7 @@ contract Issue9643Test is DSTest {
         proxied.setCounter(42);
         string memory rawDiff = vm.getStateDiffJson();
         assertEq(
-            "{\"0x2e234dae75c793f67a35089c9d99245e1c58470b\":{\"label\":null,\"balanceDiff\":null,\"stateDiff\":{\"0x0000000000000000000000000000000000000000000000000000000000000000\":{\"previousValue\":\"0x0000000000000000000000000000000000000000000000000000000000000000\",\"newValue\":\"0x000000000000000000000000000000000000000000000000000000000000002a\"}}},\"0x5615deb798bb3e4dfa0139dfa1b3d433cc23b72f\":{\"label\":null,\"balanceDiff\":null,\"stateDiff\":{}}}",
+            "{\"0x2e234dae75c793f67a35089c9d99245e1c58470b\":{\"label\":null,\"balanceDiff\":null,\"stateDiff\":{\"0x0000000000000000000000000000000000000000000000000000000000000000\":{\"previousValue\":\"0x0000000000000000000000000000000000000000000000000000000000000000\",\"newValue\":\"0x000000000000000000000000000000000000000000000000000000000000002a\"}}}}",
             rawDiff
         );
     }