Clear the node list when switching directories. Otherwise navigating out of a directory and back in single window mode will show no nodes whatsoever.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29419 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/tracker/PoseView.cpp

@@ -7467,6 +7467,7 @@ BPoseView::SwitchDir(const entry_ref *newDirRef, AttributeStreamNode *node)
 	// the new add_poses thread will then set fAddPosesThread to its ID and it
 	// will be allowed to add icons
 	fAddPosesThreads.clear();
+	fInsertedNodes.clear();
 
 	delete fModel;
 	fModel = model;