For compatiblity reasons, Wine will request iconic state and cannot
ensure that the WM has agreed on it; immediately revert to normal to
avoid being stuck in a paused state.
This patch introduces a proprietary atom I3_FLOATING_WINDOW which will be
set and maintained for floating windows and removed on tiling containers.
This allows users to select on this atom, e.g., in their compositor
configuration or in utility scripts (without using the IPC).
fixes#2223
Manually updating a magic number doesn’t work in the long run.
With this change, the number of atoms contained in
include/atoms_NET_SUPPORTED.xmacro is used.
fixes#2230