gnome: improve video widget

aspect ratio should now get properly reset when changing video source

Refs #66538

Change-Id: I679089f8908f114011a615d9518aaf1b979d7327
diff --git a/src/currentcallview.cpp b/src/currentcallview.cpp
index eac3dc3..c43ed00 100644
--- a/src/currentcallview.cpp
+++ b/src/currentcallview.cpp
@@ -370,7 +370,8 @@
     );
 
     /* local renderer */
-    push_new_renderer(view, Video::PreviewManager::instance()->previewRenderer(), VIDEO_RENDERER_LOCAL);
+    if (Video::PreviewManager::instance()->isPreviewing())
+        push_new_renderer(view, Video::PreviewManager::instance()->previewRenderer(), VIDEO_RENDERER_LOCAL);
 
     /* callback for local renderer */
     priv->local_renderer_connection = QObject::connect(