Emit audio / video document change signals

src/UI/VivyDocumentView.cc

@@ -106,6 +106,8 @@ VivyDocumentView::loadVideoView() noexcept
     videoView->setWidget(new VideoView(videoView));
     qobject_cast<VideoView *>(videoView->widget())
         ->loadFile(document->getVideoSubDocument()->getFilePath());
+
+    emit videoSubDocumentChanged();
 }
 
 void
@@ -158,6 +160,8 @@ VivyDocumentView::loadAudioView() noexcept
     Utils::deleteInternalWidget(visualizer);
     visualizer->setWidget(visualizerInner);
     visualizer->layout()->setAlignment(visualizerInner, Qt::AlignTop);
+
+    emit audioSubDocumentChanged();
 }
 
 void