exportdialog: use wait for close code from previous commit when closing the

export dialog

app/dialog/export/export.cpp

@@ -258,6 +258,13 @@ void ExportDialog::accept()
   QMetaObject::invokeMethod(exporter, "StartExporting", Qt::QueuedConnection);
 }
 
+void ExportDialog::closeEvent(QCloseEvent *e)
+{
+  preview_viewer_->ConnectViewerNode(nullptr);
+
+  QDialog::closeEvent(e);
+}
+
 void ExportDialog::BrowseFilename()
 {
   const ExportFormat& current_format = formats_.at(format_combobox_->currentIndex());

app/dialog/export/export.h

@@ -21,6 +21,9 @@ public:
 public slots:
   virtual void accept() override;
 
+protected:
+  virtual void closeEvent(QCloseEvent *e) override;
+
 private:
   void SetUpFormats();
   void LoadPresets();

app/render/backend/renderbackend.cpp

@@ -238,12 +238,6 @@ void RenderBackend::DisconnectViewer(ViewerOutput *node)
 
 void RenderBackend::CacheNext()
 {
-  if (!Init()
-      || !ViewerIsConnected()
-      || !CanRender()) {
-    return;
-  }
-
   if (cache_queue_.isEmpty()) {
     if (AllProcessorsAreAvailable()) {
       emit QueueComplete();
@@ -252,6 +246,12 @@ void RenderBackend::CacheNext()
     return;
   }
 
+  if (!Init()
+      || !ViewerIsConnected()
+      || !CanRender()) {
+    return;
+  }
+
   if ((input_update_queued_ || recompile_queued_) && !AllProcessorsAreAvailable()) {
     return;
   }
@@ -333,7 +333,7 @@ void RenderBackend::CancelQueue()
     if (processor_busy_state_.at(i))
       busy++;
   }
-  qDebug() << this << "has" << busy << "busy workers";
+  qDebug() << this << "is waiting for" << busy << "busy workers";
 
   cancel_dialog_->RunIfWorkersAreBusy();
 }