reimplement sfr queue clearing

app/render/previewautocacher.cpp

@@ -83,6 +83,18 @@ RenderTicketPtr PreviewAutoCacher::GetRangeOfAudio(TimeRange range, RenderTicket
   return RenderAudio(copied_viewer_node_->GetConnectedSampleOutput(), range, priority, nullptr);
 }
 
+void PreviewAutoCacher::ClearSingleFrameRenders()
+{
+  QMap<RenderTicketWatcher*, QVector<RenderTicketPtr> > copy = video_immediate_passthroughs_;
+  for (auto it=copy.cbegin(); it!=copy.cend(); it++) {
+    it.key()->Cancel();
+    if (!it.key()->IsRunning()) {
+      RenderManager::instance()->RemoveTicket(it.key()->GetTicket());
+      emit it.key()->GetTicket()->Finished();
+    }
+  }
+}
+
 void PreviewAutoCacher::VideoInvalidatedFromCache(const TimeRange &range)
 {
   PlaybackCache *cache = static_cast<PlaybackCache*>(sender());

app/render/previewautocacher.h

@@ -55,6 +55,8 @@ public:
 
   RenderTicketPtr GetRangeOfAudio(TimeRange range, RenderTicketPriority prioritize);
 
+  void ClearSingleFrameRenders();
+
   /**
    * @brief Set the viewer node to auto-cache
    */

app/widget/viewer/viewer.cpp

@@ -665,8 +665,7 @@ void ViewerWidget::ForceRequeueFromCurrentTime()
   // Allow half a second for requeue to complete
   static const rational kRequeueWaitTime(1);
 
-  qDebug() << "FIXME: Should be able to clear our frames";
-  //ClearVideoAutoCacherQueue();
+  auto_cacher_->ClearSingleFrameRenders();
   queue_watchers_.clear();
   int queue = DeterminePlaybackQueueSize();
   playback_queue_next_frame_ = GetTimestamp() + playback_speed_ * Timecode::time_to_timestamp(kRequeueWaitTime, timebase(), Timecode::kFloor);;
@@ -822,6 +821,7 @@ void ViewerWidget::PauseInternal()
 
     qDeleteAll(queue_watchers_);
     queue_watchers_.clear();
+    auto_cacher_->ClearSingleFrameRenders();
 
     playback_backup_timer_.stop();