make header user icon reflect comment identity

ui/component/header/index.js

@@ -7,6 +7,7 @@ import { doClearEmailEntry, doClearPasswordEntry } from 'redux/actions/user';
 import { doSetClientSetting } from 'redux/actions/settings';
 import { doSignOut, doOpenModal } from 'redux/actions/app';
 import { makeSelectClientSetting } from 'redux/selectors/settings';
+import { selectCommentChannel } from 'redux/selectors/comments';
 import Header from './view';
 import { selectHasNavigated } from 'redux/selectors/app';
 
@@ -24,6 +25,7 @@ const select = state => ({
   hasNavigated: selectHasNavigated(state),
   user: selectUser(state),
   myChannels: selectMyChannelClaims(state),
+  commentChannel: selectCommentChannel(state),
 });
 
 const perform = dispatch => ({

ui/component/header/view.jsx

@@ -61,6 +61,7 @@ type Props = {
   isAbsoluteSideNavHidden: boolean,
   hideCancel: boolean,
   myChannels: ?Array<ChannelClaim>,
+  commentChannel: string,
 };
 
 const Header = (props: Props) => {
@@ -87,6 +88,7 @@ const Header = (props: Props) => {
     user,
     hideCancel,
     myChannels,
+    commentChannel,
   } = props;
   const isMobile = useIsMobile();
   // on the verify page don't let anyone escape other than by closing the tab to keep session data consistent
@@ -98,9 +100,16 @@ const Header = (props: Props) => {
   const { backLabel, backNavDefault, title: backTitle, simpleTitle: simpleBackTitle } = backout || {};
   const notificationsEnabled = user && user.experimental_ui;
   let channelUrl;
-  if (myChannels && myChannels.length === 1) {
-    const channel = myChannels[0];
-    channelUrl = channel.permanent_url || channel.canonical_url;
+  let identityChannel;
+  if (myChannels && myChannels.length > 1) {
+    if (myChannels.length === 1) {
+      identityChannel = myChannels[0];
+    } else if (commentChannel) {
+      identityChannel = myChannels.find(chan => chan.name === commentChannel);
+    } else {
+      identityChannel = myChannels[0];
+    }
+    channelUrl = identityChannel && (identityChannel.permanent_url || identityChannel.canonical_url);
   }
   // Sign out if they click the "x" when they are on the password prompt
   const authHeaderAction = syncError ? { onClick: signOut } : { navigate: '/' };