This reverts commit d837a64e36.
Commit 24b31d96e9 fixes the original
problem of "ghost windows" that d837a64 was trying to solve. (I have no
idea how or why it does.)
One side-effect of the workaround from d837a64 is that it causes closed
windows to be moved to the (0,0) before being destroyed. This means that
when creating new windows, they are placed on the left-most display,
instead of the display in which the previously closed window was on as
you would expect. Reverting this kludge fixes this bug.
7589bf4b11