add callback, comment

src/app/tabs/run-tab.js

@@ -200,7 +200,7 @@ function runTab (container, appAPI, appEvents, opts) {
   var selectExEnv = el.querySelector('#selectExEnvOptions')
   selectExEnv.addEventListener('change', function (event) {
     executionContext.executionContextChange(selectExEnv.options[selectExEnv.selectedIndex].value, null, () => {
-      // set the new context. if that fails, rollback the current one.
+      // set the final context. Cause it is possible that this is not the one we've originaly selected
       selectExEnv.value = executionContext.getProvider()
     })
 

src/execution-context.js

@@ -112,8 +112,8 @@ function ExecutionContext () {
   }
 
   this.executionContextChange = function (context, endPointUrl, cb) {
+    if (!cb) cb = () => {}
     function runPrompt () {
-      console.log('runPrompt')
       executionContext = context
       if (!endPointUrl) {
         endPointUrl = 'http://localhost:8545'
@@ -121,6 +121,10 @@ function ExecutionContext () {
       modalDialogCustom.prompt(null, 'Web3 Provider Endpoint', endPointUrl, (target) => {
         setProviderFromEndpoint(target)
         self.event.trigger('contextChanged', ['web3'])
+        cb()
+      }, () => {
+        self.event.trigger('contextChanged', ['web3'])
+        cb()
       })
     }
 
@@ -135,9 +139,7 @@ function ExecutionContext () {
         executionContext = context
         web3.setProvider(injectedProvider)
         self.event.trigger('contextChanged', ['injected'])
-        console.log('injected')
       } else if (context === 'vm') {
-        console.log('vm!!')
         executionContext = context
         vm.stateManager.revert(function () {
           vm.stateManager.checkpoint()