fix tablet switch recovery and inbox rejoin

Signed-off-by: kenny lopez <klopez4212@gmail.com>

mobile/lib/features/activity/activity_page.dart

@@ -101,6 +101,25 @@ class ActivityPage extends HookConsumerWidget {
 
     final channels = channelsAsync.asData?.value ?? const <Channel>[];
     final channelById = {for (final c in channels) c.id: c};
+    final memberChannelIds = {
+      for (final channel in channels)
+        if (channel.isMember) channel.id,
+    };
+    final memberChannelIdsKey = memberChannelIds.toList()..sort();
+    final previousMemberChannelIds = useRef<Set<String>>(memberChannelIds);
+    useEffect(() {
+      final rejoinedChannelIds = leftChannelIds.value.where(
+        (channelId) =>
+            !previousMemberChannelIds.value.contains(channelId) &&
+            memberChannelIds.contains(channelId),
+      );
+      if (rejoinedChannelIds.isNotEmpty) {
+        leftChannelIds.value = {...leftChannelIds.value}
+          ..removeAll(rejoinedChannelIds);
+      }
+      previousMemberChannelIds.value = memberChannelIds;
+      return null;
+    }, [memberChannelIdsKey.join('\u0000')]);
 
     int? markerOf(String contextId) => readState.effectiveTimestamp(contextId);
     bool isDone(InboxItem item) => isInboxItemDone(

mobile/lib/features/channels/channels_page/wide_navigation.dart

@@ -34,7 +34,7 @@ class WideChannelsNavigation extends HookConsumerWidget {
   final bool isCommunitySwitching;
   final ValueChanged<String?> onCommunitySwitchStart;
   final String? pendingCommunityId;
-  final bool isActivityReady;
+  final bool isActivitySettled;
   final VoidCallback onCommunitySwitchComplete;
   final List<WideNavigationDestination> destinations;
 
@@ -48,7 +48,7 @@ class WideChannelsNavigation extends HookConsumerWidget {
     required this.isCommunitySwitching,
     required this.onCommunitySwitchStart,
     required this.pendingCommunityId,
-    required this.isActivityReady,
+    required this.isActivitySettled,
     required this.onCommunitySwitchComplete,
     required this.destinations,
   });
@@ -69,8 +69,8 @@ class WideChannelsNavigation extends HookConsumerWidget {
       () {
         if (pendingCommunityId != activeCommunityId ||
             channelsAsync.isLoading ||
-            !channelsAsync.hasValue ||
-            !isActivityReady) {
+            !(channelsAsync.hasValue || channelsAsync.hasError) ||
+            !isActivitySettled) {
           return null;
         }
         final timer = Timer(
@@ -84,7 +84,8 @@ class WideChannelsNavigation extends HookConsumerWidget {
         activeCommunityId,
         channelsAsync.isLoading,
         channelsAsync.hasValue,
-        isActivityReady,
+        channelsAsync.hasError,
+        isActivitySettled,
       ],
     );
     final channels = (channelsAsync.asData?.value ?? const <Channel>[])

mobile/lib/features/home/home_page.dart

@@ -80,7 +80,9 @@ class HomePage extends HookConsumerWidget {
     }
     final isCommunitySwitching = pendingCommunityId.value != null;
     final activityAsync = ref.watch(activityProvider);
-    final isActivityReady = activityAsync.hasValue && !activityAsync.isLoading;
+    final isActivitySettled =
+        !activityAsync.isLoading &&
+        (activityAsync.hasValue || activityAsync.hasError);
     final systemBottomInset = MediaQuery.paddingOf(context).bottom;
     final navigationBarWidth = _floatingTabBarWidth(
       MediaQuery.sizeOf(context).width,
@@ -175,7 +177,7 @@ class HomePage extends HookConsumerWidget {
                             pendingCommunityId.value = communityId;
                           },
                           pendingCommunityId: pendingCommunityId.value,
-                          isActivityReady: isActivityReady,
+                          isActivitySettled: isActivitySettled,
                           onCommunitySwitchComplete: () {
                             pendingCommunityId.value = null;
                           },