ui: shorten OpReader.Decode for loops

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

ui/input/key.go

@@ -88,11 +88,7 @@ func (q *keyQueue) resolveFocus(events handlerEvents) (Key, listenerPriority, bo
 	var pri listenerPriority
 	var hide bool
 loop:
-	for {
-		encOp, ok := q.reader.Decode()
-		if !ok {
-			break
-		}
+	for encOp, ok := q.reader.Decode(); ok; encOp, ok = q.reader.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
 		case ops.TypeKeyHandler:
 			var op key.HandlerOp

ui/input/pointer.go

@@ -63,11 +63,7 @@ const (
 )
 
 func (q *pointerQueue) collectHandlers(r *ui.OpsReader, events handlerEvents, t ui.Transform, area, node int, pass bool) {
-	for {
-		encOp, ok := r.Decode()
-		if !ok {
-			return
-		}
+	for encOp, ok := r.Decode(); ok; encOp, ok = r.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
 		case ops.TypePush:
 			q.collectHandlers(r, events, t, area, node, pass)