This kind-of-reverts 058dbab828.
If banning_refresh() is called, only the lua events that it generated before are
now generated (the unfocus event). The actual mapping and unmapping of X11
windows is defered until the end of the main loop via a new per-screen
need_lazy_banning flag.
Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Danjou <julien@danjou.info>
We now move (and so, arrange) windows anywhen so we need to ignore
spurious leaver/enter events in client_resize() too.
We still need it un arrange for unmap/map. It's probably that the call
to client_ignore_enterleave_events() should be made in client_ban, but
it would be too much expansive to call it outside arrange() since it is
the only caller of client_ban/unban.
Signed-off-by: Julien Danjou <julien@danjou.info>