allow hiding client stickies

Fixes #105

lib/controllers/room_chat.dart

@@ -97,6 +97,25 @@ class RoomChatController(final ChatParams info)
         ),
       );
 
+  void hideClientSticky(int eventRowId) => ref
+      .read(RoomsController.provider.notifier)
+      .update(
+        .new({
+          info.roomId: Room(
+            resetClientSticky: true,
+            clientSticky:
+                ref
+                    .read(
+                      RoomsController.provider.select(
+                        (rooms) => rooms[info.roomId]?.clientSticky,
+                      ),
+                    )
+                    ?.remove(eventRowId) ??
+                .new(),
+          ),
+        }),
+      );
+
   Future<void> paginate(Direction direction) async {
     if (state.isLoading) return;
 

lib/controllers/rooms.dart

@@ -46,13 +46,16 @@ class RoomsController extends Notifier<IMap<String, Room>> {
         roomId,
         existing?.copyWith(
               hasMore: incoming.hasMore,
-              clientSticky:
-                  (incoming.clientSticky.isEmpty == true
-                          ? existing.clientSticky
-                          : existing.clientSticky.addAll(incoming.clientSticky))
-                      .removeWhere(
-                        (rowId) => incoming.timeline.values.contains(rowId),
-                      ),
+              clientSticky: incoming.resetClientSticky
+                  ? incoming.clientSticky
+                  : (incoming.clientSticky.isEmpty == true
+                            ? existing.clientSticky
+                            : existing.clientSticky.addAll(
+                                incoming.clientSticky,
+                              ))
+                        .removeWhere(
+                          (rowId) => incoming.timeline.values.contains(rowId),
+                        ),
               metadata: incoming.metadata ?? existing.metadata,
               events: incoming.events.isEmpty
                   ? existing.events
@@ -64,6 +67,7 @@ class RoomsController extends Notifier<IMap<String, Room>> {
                   (previousValue[event.key] ?? .new()).addAll(event.value),
                 ),
               ),
+              resetClientSticky: false,
               reset: false,
               hasFetchedMembers:
                   incoming.hasFetchedMembers || existing.hasFetchedMembers,