When the "File Structure" pane is docked to the side of Visual Studio, but not pinned in place, dragging class members reorders them in the source window but does not update their order in the FS pane. Pinning the FS pane after a drag/drop causes it to refresh. When the File Structure pane is pinned, member reordering works as expected. Expected: Drag-and-drop when not pinned causes the FS pane to refresh.