Save recent network balances in local storage (#5843)

* Use selector for state.metamask.accounts in all cases.

* Default to cached balance when selecting metamask accounts

* Adds the cached-balances controller

* Documentation and small codes fixes for #5843

Co-Authored-By: danjm <danjm.com@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/ui/app/components/pages/create-account/import-account/json.js b/ui/app/components/pages/create-account/import-account/json.js
index 90279bbbd..bb6771e4d 100644
--- a/ui/app/components/pages/create-account/import-account/json.js
+++ b/ui/app/components/pages/create-account/import-account/json.js
@@ -7,6 +7,7 @@ const connect = require('react-redux').connect
 const actions = require('../../../../actions')
 const FileInput = require('react-simple-file-input').default
 const { DEFAULT_ROUTE } = require('../../../../routes')
+const { getMetaMaskAccounts } = require('../../../../selectors')
 const HELP_LINK = 'https://support.metamask.io/kb/article/7-importing-accounts'
 import Button from '../../../button'
 
@@ -136,7 +137,7 @@ JsonImportSubview.propTypes = {
 const mapStateToProps = state => {
   return {
     error: state.appState.warning,
-    firstAddress: Object.keys(state.metamask.accounts)[0],
+    firstAddress: Object.keys(getMetaMaskAccounts(state))[0],
   }
 }