make sure call hash are unique

libs/remix-lib/src/execution/txRunnerVM.ts

@@ -15,6 +15,7 @@ export class TxRunnerVM {
   blocks
   logsManager
   commonContext
+  nextNonceForCall: number
   getVMObject: () => any
 
   constructor (vmaccounts, api, getVMObject) {
@@ -31,6 +32,13 @@ export class TxRunnerVM {
     this.vmaccounts = vmaccounts
     this.queusTxs = []
     this.blocks = []
+    /*
+      txHash is generated using the nonce,
+      in order to have unique transaction hash, we need to keep using different nonce (in case of a call)
+      so we increment this value after each call.
+      For this to function we also need to skip nonce validation, in the vm: `{ skipNonce: true }`
+    */
+    this.nextNonceForCall = 0
   }
 
   execute (args, confirmationCb, gasEstimationForceSend, promptCb, callback) {
@@ -75,7 +83,7 @@ export class TxRunnerVM {
       let tx
       if (!EIP1559) {
         tx = Transaction.fromTxData({
-          nonce: new BN(res.nonce),
+          nonce: useCall ? this.nextNonceForCall : new BN(res.nonce),
           gasPrice: '0x1',
           gasLimit: gasLimit,
           to: to,
@@ -84,7 +92,7 @@ export class TxRunnerVM {
         }, { common: this.commonContext }).sign(account.privateKey)
       } else {
         tx = FeeMarketEIP1559Transaction.fromTxData({
-          nonce: new BN(res.nonce),
+          nonce: useCall ? this.nextNonceForCall : new BN(res.nonce),
           maxPriorityFeePerGas: '0x01',
           maxFeePerGas: '0x1',
           gasLimit: gasLimit,
@@ -93,6 +101,7 @@ export class TxRunnerVM {
           data: Buffer.from(data.slice(2), 'hex')
         }).sign(account.privateKey)
       }
+      if (useCall) this.nextNonceForCall++
 
       const coinbases = ['0x0e9281e9c6a0808672eaba6bd1220e144c9bb07a', '0x8945a1288dc78a6d8952a92c77aee6730b414778', '0x94d76e24f818426ae84aa404140e8d5f60e10e7e']
       const difficulties = [new BN('69762765929000', 10), new BN('70762765929000', 10), new BN('71762765929000', 10)]
@@ -127,7 +136,7 @@ export class TxRunnerVM {
   }
 
   runBlockInVm (tx, block, callback) {
-    this.getVMObject().vm.runBlock({ block: block, generate: true, skipBlockValidation: true, skipBalance: false }).then((results) => {
+    this.getVMObject().vm.runBlock({ block: block, generate: true, skipBlockValidation: true, skipBalance: false, skipNonce: true }).then((results) => {
       const result = results.results[0]
       if (result) {
         const status = result.execResult.exceptionError ? 0 : 1