channel [nfc]: Rename references of ChannelStoreImpl to match it's name

Fixes parts of #631

Author: Khader-1

lib/model/store.dart

@@ -226,7 +226,7 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
     connection ??= globalStore.apiConnectionFromAccount(account);
     assert(connection.zulipFeatureLevel == account.zulipFeatureLevel);
 
-    final streams = ChannelStoreImpl(initialSnapshot: initialSnapshot);
+    final channels = ChannelStoreImpl(initialSnapshot: initialSnapshot);
     return PerAccountStore._(
       globalStore: globalStore,
       connection: connection,
@@ -247,12 +247,12 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
         selfUserId: account.userId,
         typingStartedExpiryPeriod: Duration(milliseconds: initialSnapshot.serverTypingStartedExpiryPeriodMilliseconds),
       ),
-      streams: streams,
+      channels: channels,
       messages: MessageStoreImpl(),
       unreads: Unreads(
         initial: initialSnapshot.unreadMsgs,
         selfUserId: account.userId,
-        channelStore: streams,
+        channelStore: channels,
       ),
       recentDmConversationsView: RecentDmConversationsView(
         initial: initialSnapshot.recentPrivateConversations, selfUserId: account.userId),
@@ -272,15 +272,15 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
     required this.userSettings,
     required this.users,
     required this.typingStatus,
-    required ChannelStoreImpl streams,
+    required ChannelStoreImpl channels,
     required MessageStoreImpl messages,
     required this.unreads,
     required this.recentDmConversationsView,
   }) : assert(selfUserId == globalStore.getAccount(accountId)!.userId),
        assert(realmUrl == globalStore.getAccount(accountId)!.realmUrl),
        assert(realmUrl == connection.realmUrl),
        _globalStore = globalStore,
-       _streams = streams,
+       _channels = channels,
        _messages = messages;
 
   ////////////////////////////////////////////////////////////////
@@ -331,19 +331,19 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
   // Streams, topics, and stuff about them.
 
   @override
-  Map<int, ZulipStream> get streams => _streams.streams;
+  Map<int, ZulipStream> get streams => _channels.streams;
   @override
-  Map<String, ZulipStream> get streamsByName => _streams.streamsByName;
+  Map<String, ZulipStream> get streamsByName => _channels.streamsByName;
   @override
-  Map<int, Subscription> get subscriptions => _streams.subscriptions;
+  Map<int, Subscription> get subscriptions => _channels.subscriptions;
   @override
   UserTopicVisibilityPolicy topicVisibilityPolicy(int streamId, String topic) =>
-    _streams.topicVisibilityPolicy(streamId, topic);
+    _channels.topicVisibilityPolicy(streamId, topic);
 
-  final ChannelStoreImpl _streams;
+  final ChannelStoreImpl _channels;
 
   @visibleForTesting
-  ChannelStoreImpl get debugStreamStore => _streams;
+  ChannelStoreImpl get debugChannelStore => _channels;
 
   ////////////////////////////////
   // Messages, and summaries of messages.
@@ -474,17 +474,17 @@ class PerAccountStore extends ChangeNotifier with ChannelStore, MessageStore {
 
       case StreamEvent():
         assert(debugLog("server event: stream/${event.op}"));
-        _streams.handleStreamEvent(event);
+        _channels.handleStreamEvent(event);
         notifyListeners();
 
       case SubscriptionEvent():
         assert(debugLog("server event: subscription/${event.op}"));
-        _streams.handleSubscriptionEvent(event);
+        _channels.handleSubscriptionEvent(event);
         notifyListeners();
 
       case UserTopicEvent():
         assert(debugLog("server event: user_topic"));
-        _streams.handleUserTopicEvent(event);
+        _channels.handleUserTopicEvent(event);
         notifyListeners();
 
       case MessageEvent():

test/model/channel_test.dart

@@ -193,8 +193,8 @@ void main() {
       final expectedStore = eg.store(initialSnapshot: eg.initialSnapshot(
         userTopics: expected,
       ));
-      check(store.debugStreamStore.topicVisibility)
-        .deepEquals(expectedStore.debugStreamStore.topicVisibility);
+      check(store.debugChannelStore.topicVisibility)
+        .deepEquals(expectedStore.debugChannelStore.topicVisibility);
     }
 
     test('data structure', () {
@@ -206,7 +206,7 @@ void main() {
           eg.userTopicItem(stream2, 'topic 3', UserTopicVisibilityPolicy.unknown),
           eg.userTopicItem(stream2, 'topic 4', UserTopicVisibilityPolicy.followed),
         ]));
-      check(store.debugStreamStore.topicVisibility).deepEquals({
+      check(store.debugChannelStore.topicVisibility).deepEquals({
         stream1.streamId: {
           'topic 1': UserTopicVisibilityPolicy.muted,
           'topic 2': UserTopicVisibilityPolicy.unmuted,