Ensure that gas fee/prices params are not updated while in send edit stage/mode (#11620)

* Ensure that gas fee/prices params are not updated while in send edit stage/mode

* Allow editing of txparams gas price when not on eip1559 network, in send flow

ui/ducks/send/send.js

@@ -1508,6 +1508,7 @@ export function signTransaction() {
       draftTransaction: { id, txParams },
       recipient: { address },
       amount: { value },
+      eip1559support,
     } = state[name];
     if (stage === SEND_STAGES.EDIT) {
       // When dealing with the edit flow there is already a transaction in
@@ -1516,10 +1517,21 @@ export function signTransaction() {
       // merge in the modified txParams. Once the transaction has been modified
       // we can send that to the background to update the transaction in state.
       const unapprovedTxs = getUnapprovedTxs(state);
+      // We only update the tx params that can be changed via the edit flow UX
+      const eip1559OnlyTxParamsToUpdate = {
+        data: txParams.data,
+        from: txParams.from,
+        to: txParams.to,
+        value: txParams.value,
+        gas: txParams.gas,
+      };
       const unapprovedTx = unapprovedTxs[id];
       const editingTx = {
         ...unapprovedTx,
-        txParams: Object.assign(unapprovedTx.txParams, txParams),
+        txParams: Object.assign(
+          unapprovedTx.txParams,
+          eip1559support ? eip1559OnlyTxParamsToUpdate : txParams,
+        ),
       };
       dispatch(updateTransaction(editingTx));
     } else if (asset.type === ASSET_TYPES.TOKEN) {