renderer: fixed bug that would hang exports after 1 x (cores) frames

were exported

app/render/backend/videorenderbackend.cpp

@@ -144,6 +144,7 @@ void VideoRenderBackend::ConnectWorkerToThis(RenderWorker *processor)
   connect(video_processor, &VideoRenderWorker::CompletedDownload, this, &VideoRenderBackend::ThreadCompletedDownload, Qt::QueuedConnection);
   connect(video_processor, &VideoRenderWorker::HashAlreadyExists, this, &VideoRenderBackend::ThreadHashAlreadyExists, Qt::QueuedConnection);
   connect(video_processor, &VideoRenderWorker::GeneratedFrame, this, &VideoRenderBackend::GeneratedFrame, Qt::QueuedConnection);
+  connect(video_processor, &VideoRenderWorker::GeneratedFrame, this, &VideoRenderBackend::ThreadGeneratedFrame, Qt::QueuedConnection);
 }
 
 void VideoRenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range)
@@ -307,6 +308,13 @@ void VideoRenderBackend::ThreadHashAlreadyExists(NodeDependency dep, qint64 job_
   CacheNext();
 }
 
+void VideoRenderBackend::ThreadGeneratedFrame()
+{
+  SetWorkerBusyState(static_cast<RenderWorker*>(sender()), false);
+
+  CacheNext();
+}
+
 void VideoRenderBackend::TruncateFrameCacheLength(const rational &length)
 {
   // Remove frames after this time code if it's changed

app/render/backend/videorenderbackend.h

@@ -131,6 +131,7 @@ private slots:
   void ThreadCompletedDownload(NodeDependency dep, qint64 job_time, QByteArray hash, bool texture_existed);
   void ThreadSkippedFrame(NodeDependency dep, qint64 job_time, QByteArray hash);
   void ThreadHashAlreadyExists(NodeDependency dep, qint64 job_time, QByteArray hash);
+  void ThreadGeneratedFrame();
 
   void TruncateFrameCacheLength(const rational& length);