fixes for null check / disposed widget errors

lib/pages/chat/chat.dart

@@ -416,7 +416,7 @@ class ChatController extends State<ChatPageWithRoom>
         onInsert: onInsert,
       );
       // #Pangea
-      if (visibleEvents.length < 10) {
+      if (visibleEvents.length < 10 && timeline != null) {
         int prevNumEvents = timeline!.events.length;
         await requestHistory();
         int numRequests = 0;

lib/pages/chat_list/space_view.dart

@@ -130,19 +130,27 @@ class _SpaceViewState extends State<SpaceView> {
       if (prevBatch != null) {
         response.rooms.insertAll(0, _lastResponse[activeSpaceId]?.rooms ?? []);
       }
+      // #Pangea
+      if (mounted) {
+        // Pangea#
         setState(() {
           _lastResponse[activeSpaceId] = response;
         });
+      }
       return _lastResponse[activeSpaceId]!;
     } catch (e) {
+      // #Pangea
+      if (mounted) {
+        // Pangea#
         setState(() {
           error = e;
         });
+      }
       rethrow;
     } finally {
       // #Pangea
       if (activeSpace != null) {
-        await setChatCount(
+        setChatCount(
           activeSpace,
           _lastResponse[activeSpaceId] ??
               GetSpaceHierarchyResponse(
@@ -150,12 +158,14 @@ class _SpaceViewState extends State<SpaceView> {
               ),
         );
       }
+      if (mounted) {
         // Pangea#
         setState(() {
           loading = false;
         });
       }
     }
+  }
 
   void _onJoinSpaceChild(SpaceRoomsChunk spaceChild) async {
     final client = Matrix.of(context).client;
@@ -499,6 +509,7 @@ class _SpaceViewState extends State<SpaceView> {
   }
 
   bool includeSpaceChild(sc, matchingSpaceChildren) {
+    if (!mounted) return false;
     final bool isAnalyticsRoom = sc.roomType == PangeaRoomTypes.analytics;
     final bool isMember = [Membership.join, Membership.invite]
         .contains(Matrix.of(context).client.getRoomById(sc.roomId)?.membership);