fn is_suspending(flag: &Arc<AtomicBool>) -> bool {
    !flag.swap(false, Ordering::SeqCst)
}
Looks, if leftwm can be suspended at the moment.
## Returns
- `true` if leftwm doesn't need to do anything at them moment
- `false` if leftwm needs to refresh its state
leftwm/src/bin/leftwm.rs