Possibly fix crash when room is cleared on event delegate

src/timeline/EventDelegateChooser.cpp

@@ -162,10 +162,13 @@ EventDelegateChooser::DelegateIncubator::setInitialState(QObject *obj)
 
     // setInitialProperties(rolesToSet);
 
-    auto update =
-      [this, obj, roleToPropIdx = std::move(roleToPropIdx)](const QList<int> &changedRoles) {
+    auto update = [this, obj, roleToPropIdx = std::move(roleToPropIdx)](
+                    const QList<int> &changedRoles, TimelineModel *room) {
+        if (!room)
+            return;
+
         if (changedRoles.empty() || changedRoles.contains(TimelineModel::Roles::Type)) {
-              int type = chooser.room_
+            int type = room
                          ->dataById(currentId,
                                     TimelineModel::Roles::Type,
                                     forReply ? chooser.eventId_ : QString())
@@ -195,8 +198,7 @@ EventDelegateChooser::DelegateIncubator::setInitialState(QObject *obj)
             return;
 
         auto mo = obj->metaObject();
-          chooser.room_->multiData(
-            currentId, forReply ? chooser.eventId_ : QString(), rolesToRequest);
+        room->multiData(currentId, forReply ? chooser.eventId_ : QString(), rolesToRequest);
 
         Qt::beginPropertyUpdateGroup();
         for (const auto &role : rolesToRequest) {
@@ -211,18 +213,27 @@ EventDelegateChooser::DelegateIncubator::setInitialState(QObject *obj)
           chooser.room_,
           &QAbstractItemModel::dataChanged,
           obj,
-          [row, update](const QModelIndex &topLeft,
+          [row, update, room = chooser.room_](const QModelIndex &topLeft,
                                               const QModelIndex &bottomRight,
                                               const QList<int> &changedRoles) {
               if (row < topLeft.row() || row > bottomRight.row())
                   return;
 
-              update(changedRoles);
+              update(changedRoles, room);
           },
           Qt::QueuedConnection);
-        connect(&this->chooser, &EventDelegateChooser::destroyed, obj, [connection]() {
-            QObject::disconnect(connection);
-        });
+        connect(
+          &this->chooser,
+          &EventDelegateChooser::destroyed,
+          obj,
+          [connection]() { QObject::disconnect(connection); },
+          Qt::SingleShotConnection);
+        connect(
+          &this->chooser,
+          &EventDelegateChooser::roomChanged,
+          obj,
+          [connection]() { QObject::disconnect(connection); },
+          Qt::SingleShotConnection);
     }
 }