xmonad: resurface hidden Z workspaces when shifting X Coord
xmonad: resurface hidden Z workspaces when shifting X Coord

When moving away on the X-axis, if the current workspace is empty, try
to find a non-empty workspace is the Z coord first before moving away.
This way we don't have to press xK_n to find such a workspace the next
time we revisit this X coord.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg