Simplify routing to fix breakage in popup

ui/app/pages/settings/networks-tab/network-form/network-form.component.js

@@ -68,10 +68,6 @@ export default class NetworkForm extends PureComponent {
   }
 
   componentWillUnmount () {
-    // onClear will push the network settings route unless was pass false.
-    // Since we call onClear to cause this component to be unmounted, the
-    // route will already have been updated, and we avoid setting it twice.
-    this.props.onClear(false)
     this.setState({
       rpcUrl: '',
       chainId: '',
@@ -80,6 +76,11 @@ export default class NetworkForm extends PureComponent {
       blockExplorerUrl: '',
       errors: {},
     })
+
+    // onClear will push the network settings route unless was pass false.
+    // Since we call onClear to cause this component to be unmounted, the
+    // route will already have been updated, and we avoid setting it twice.
+    this.props.onClear(false)
   }
 
   resetForm () {

ui/app/pages/settings/networks-tab/networks-tab.component.js

@@ -101,7 +101,9 @@ export default class NetworksTab extends PureComponent {
         onClick={() => {
           setNetworksTabAddMode(false)
           setSelectedSettingsRpcUrl(rpcUrl)
-          !isFullScreen && history.push(NETWORKS_FORM_ROUTE)
+          if (!isFullScreen) {
+            history.push(NETWORKS_FORM_ROUTE)
+          }
         }}
       >
         <NetworkDropdownIcon

ui/app/pages/settings/settings.component.js

@@ -1,6 +1,6 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
-import { Switch, Route, Redirect, matchPath } from 'react-router-dom'
+import { Switch, Route, matchPath } from 'react-router-dom'
 import classnames from 'classnames'
 import TabBar from '../../components/app/tab-bar'
 import {
@@ -11,7 +11,6 @@ import {
   ABOUT_US_ROUTE,
   SETTINGS_ROUTE,
   NETWORKS_ROUTE,
-  NETWORKS_FORM_ROUTE,
   CONTACT_LIST_ROUTE,
   CONTACT_ADD_ROUTE,
   CONTACT_EDIT_ROUTE,
@@ -36,7 +35,6 @@ class SettingsPage extends PureComponent {
     history: PropTypes.object,
     isAddressEntryPage: PropTypes.bool,
     isPopup: PropTypes.bool,
-    isFullScreen: PropTypes.bool,
     pathnameI18nKey: PropTypes.string,
     initialBreadCrumbRoute: PropTypes.string,
     breadCrumbTextKey: PropTypes.string,
@@ -130,7 +128,7 @@ class SettingsPage extends PureComponent {
       subheaderText = t(pathnameI18nKey || 'general')
     }
 
-    return currentPath !== NETWORKS_ROUTE && (
+    return !currentPath?.startsWith(NETWORKS_ROUTE) && (
       <div className="settings-page__subheader">
         <div
           className={classnames({ 'settings-page__subheader--link': initialBreadCrumbRoute })}
@@ -179,8 +177,6 @@ class SettingsPage extends PureComponent {
   }
 
   renderContent () {
-    const { isFullScreen } = this.props
-
     return (
       <Switch>
         <Route
@@ -204,13 +200,9 @@ class SettingsPage extends PureComponent {
           component={AlertsTab}
         />
         <Route
-          exact
           path={NETWORKS_ROUTE}
           component={NetworksTab}
         />
-        <Route exact path={NETWORKS_FORM_ROUTE}>
-          {isFullScreen ? <Redirect to={NETWORKS_ROUTE} /> : NetworksTab}
-        </Route>
         <Route
           exact
           path={SECURITY_ROUTE}

ui/app/pages/settings/settings.container.js

@@ -3,10 +3,7 @@ import { connect } from 'react-redux'
 import { withRouter } from 'react-router-dom'
 import { getAddressBookEntryName } from '../../selectors'
 import { isValidAddress } from '../../helpers/utils/util'
-import {
-  ENVIRONMENT_TYPE_POPUP,
-  ENVIRONMENT_TYPE_FULLSCREEN,
-} from '../../../../app/scripts/lib/enums'
+import { ENVIRONMENT_TYPE_POPUP } from '../../../../app/scripts/lib/enums'
 import { getEnvironmentType } from '../../../../app/scripts/lib/util'
 import { getMostRecentOverviewPage } from '../../ducks/history/history'
 
@@ -57,7 +54,6 @@ const mapStateToProps = (state, ownProps) => {
   const isNetworksFormPage = Boolean(pathname.match(NETWORKS_FORM_ROUTE))
 
   const isPopup = getEnvironmentType() === ENVIRONMENT_TYPE_POPUP
-  const isFullScreen = getEnvironmentType() === ENVIRONMENT_TYPE_FULLSCREEN
   const pathnameI18nKey = ROUTES_TO_I18N_KEYS[pathname]
 
   let backRoute = SETTINGS_ROUTE
@@ -90,7 +86,6 @@ const mapStateToProps = (state, ownProps) => {
     backRoute,
     currentPath: pathname,
     isPopup,
-    isFullScreen,
     pathnameI18nKey,
     addressName,
     initialBreadCrumbRoute,