I have a laptop with a docking station that has a large monitor connected to it.  When the laptop is docked, I use the monitor as my primary display, and the laptop screen as a secondary display.When I undock, the laptop screen becomes my primary display, and all the windows move over to it.  When I dock the laptop, the monitor automatically becomes the primary display again, but the windows all stay on the laptop screen.  I have to drag each one over to the monitor and resize it.How can I get my windows to automatically resume the positions and sizes they had just before I undocked (assuming they're still open)?  All I've been able to find are answers talking about restoring programs when you log in.  That's not what I'm looking for.I'm using Gnome 3 on Arch Linux.
How can I save/restore window positions when I undock/dock my laptop?
x11;gnome3;laptop;window management