app: tolerate delayed WakeupEvents

The event input channel is closed after receiving a DestroyEvent, to
catch any events erronously delivered after window close. However,
the recently introduced WakeupEvent *may* be delivered after window
close. This change leaves the even channel open even after closure,
which effectively ignores such events.

Fixes #227 (again)

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/window.go

@@ -426,7 +426,6 @@ func (w *Window) waitFrame() (*op.Ops, bool) {
 }
 
 func (w *Window) run(opts *wm.Options) {
-	defer close(w.in)
 	defer close(w.out)
 	if err := wm.NewWindow(&w.callbacks, opts); err != nil {
 		w.out <- system.DestroyEvent{Err: err}