Create callback and Clean-up details

app/scripts/metamask-controller.js

@@ -379,7 +379,12 @@ module.exports = class MetamaskController {
     this.configManager.createShapeShiftTx(depositAddress, depositType)
   }
 
-  setGasMultiplier (gasMultiplier) {
+  setGasMultiplier (gasMultiplier, cb) {
+    try{
       this.configManager.setGasMultiplier(gasMultiplier)
+      cb()
+    } catch (e) {
+      cb(e)
+    }
   }
 }

ui/app/actions.js

@@ -277,8 +277,9 @@ function signMsg (msgData) {
 }
 
 function signTx (txData) {
-  _accountManager.setGasMultiplier(txData.gasMultiplier)
   return (dispatch) => {
+    _accountManager.setGasMultiplier(txData.gasMultiplier, (err) => {
+      if (err) return dispatch(actions.displayWarning(err.message))
       web3.eth.sendTransaction(txData, (err, data) => {
         dispatch(actions.hideLoadingIndication())
         if (err) return dispatch(actions.displayWarning(err.message))
@@ -286,6 +287,7 @@ function signTx (txData) {
         dispatch(actions.goHome())
       })
       dispatch(this.showConfTxPage())
+    })
   }
 }
 

ui/app/components/range-slider.js

@@ -35,7 +35,7 @@ RangeSlider.prototype.render = function () {
         step: increment,
         style: range,
         value: state.value || defaultValue,
-        onChange: mirrorInput ? this.mirrorInputs.bind(this, name) : onInput,
+        onChange: mirrorInput ? this.mirrorInputs.bind(this, event) : onInput,
       }),
 
       // Mirrored input for range
@@ -47,12 +47,12 @@ RangeSlider.prototype.render = function () {
         value: state.value || defaultValue,
         step: increment,
         style: input,
-        onChange: this.mirrorInputs.bind(this, `${name}Mirror`),
+        onChange: this.mirrorInputs.bind(this, event),
       }) : null,
     ])
   )
 }
 
-RangeSlider.prototype.mirrorInputs = function (active, event) {
+RangeSlider.prototype.mirrorInputs = function (event) {
   this.setState({value: event.target.value})
 }

ui/app/send.js

@@ -207,7 +207,7 @@ SendTransactionScreen.prototype.render = function () {
           },
         }),
       ]),
-      // custom gas field
+      // custom gasPrice field
       h('h3.flex-center.text-transform-uppercase', {
         style: {
           background: '#EBEBEB',