If you use 7+Taskbar Tweaker as I mentioned above and check the "drag to reorder" option, you can re-arrange the windows. See the quick video I made on this. https://youtu.be/G-D5vd5pVFQ
You can use 7+ Taskbar Tweaker (which also works on Windows 10) and check the option "drag to reorder" under thumbnails.
7+ Taskbar Tweaker - RaMMicHaeL's Blog