ui/app: make window event queue buffered

Input events are asynchronous, so add buffered to the event queue
so that a slow client does not stall the native window.

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

ui/app/window.go

@@ -89,7 +89,8 @@ func NewWindow(opts *WindowOptions) *Window {
 
 	w := &Window{
 		in: make(chan Event),
-		out:         make(chan Event),
+		// Make room for buffered input events.
+		out:         make(chan Event, 100),
 		ack:         make(chan struct{}),
 		invalidates: make(chan struct{}, 1),
 		frames:      make(chan *ui.Ops),