fix gasUsed in the receipt (#1542)

Make sure the receipt `gasUsed` is the actual amount of gas used, not the `gasLimit`.

libs/remix-lib/src/web3Provider/web3VmProvider.ts

@@ -144,8 +144,9 @@ export class Web3VmProvider {
     if (lastOp) {
       lastOp.error = lastOp.op !== 'RETURN' && lastOp.op !== 'STOP' && lastOp.op !== 'DESTRUCT'
     }
-    this.vmTraces[this.processingHash].gas = '0x' + data.gasUsed.toString(16)
-
+    const gasUsed = '0x' + data.gasUsed.toString(16)
+    this.vmTraces[this.processingHash].gas = gasUsed
+    this.txsReceipt[this.processingHash].gasUsed = gasUsed
     const logs = []
     for (const l in data.execResult.logs) {
       const log = data.execResult.logs[l]

libs/remix-simulator/src/methods/transactions.ts

@@ -102,8 +102,8 @@ export class Transactions {
         transactionIndex: '0x00',
         blockHash: '0x' + txBlock.hash().toString('hex'),
         blockNumber: '0x' + txBlock.header.number.toString('hex'),
-        gasUsed: Web3.utils.toHex(receipt.gas),
-        cumulativeGasUsed: Web3.utils.toHex(receipt.gas),
+        gasUsed: receipt.gasUsed,
+        cumulativeGasUsed: receipt.gasUsed, // only 1 tx per block
         contractAddress: receipt.contractAddress,
         logs: receipt.logs,
         status: receipt.status,