Don't spam key requests directly after startup

src/timeline/TimelineModel.cpp

@@ -379,6 +379,7 @@ TimelineModel::TimelineModel(TimelineViewManager *manager, QString room_id, QObj
         connect(&events, &EventStore::updateFlowEventId, this, [this](std::string event_id) {
                 this->updateFlowEventId(event_id);
         });
+
         // When a message is sent, check if the current edit/reply relates to that message,
         // and update the event_id so that it points to the sent message and not the pending one.
         connect(&events,
@@ -395,6 +396,11 @@ TimelineModel::TimelineModel(TimelineViewManager *manager, QString room_id, QObj
                         }
                 });
 
+        connect(manager_,
+                &TimelineViewManager::initialSyncChanged,
+                &events,
+                &EventStore::enableKeyRequests);
+
         showEventTimer.callOnTimeout(this, &TimelineModel::scrollTimerEvent);
 }