From 271cdcb19eff8b9af77cdb8c700f69f9ea37d8f9 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 18 Aug 2018 11:32:32 +0200
Subject: [PATCH] clear selection node when destroying viewer

---
 src/Gui/View3DInventorViewer.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Gui/View3DInventorViewer.cpp b/src/Gui/View3DInventorViewer.cpp
index 1e0924e400..dc2a4d4115 100644
--- a/src/Gui/View3DInventorViewer.cpp
+++ b/src/Gui/View3DInventorViewer.cpp
@@ -553,6 +553,11 @@ View3DInventorViewer::~View3DInventorViewer()
     setSceneGraph(0);
     this->pEventCallback->unref();
     this->pEventCallback = 0;
+    // Note: It can happen that there is still someone who references
+    // the root node but isn't destroyed when closing this viewer so
+    // that it prevents all children from being deleted. To reduce this
+    // likelihood we explicitly remove all child nodes now.
+    this->pcViewProviderRoot->removeAllChildren();
     this->pcViewProviderRoot->unref();
     this->pcViewProviderRoot = 0;
     this->backlight->unref();