io/router: ensure root pointer area in deferred calls

Fixes: https://todo.sr.ht/~eliasnaur/gio/372
Signed-off-by: Elias Naur <mail@eliasnaur.com>

io/router/pointer.go

@@ -141,6 +141,11 @@ const (
 
 func (c *pointerCollector) resetState() {
 	c.state = collectState{}
+	c.nodeStack = c.nodeStack[:0]
+	// Pop every node except the root.
+	if len(c.q.hitTree) > 0 {
+		c.state.nodePlusOne = 0 + 1
+	}
 }
 
 func (c *pointerCollector) setTrans(t f32.Affine2D) {
@@ -332,7 +337,6 @@ func (c *pointerCollector) offerOp(op transfer.OfferOp, events *handlerEvents) {
 func (c *pointerCollector) reset() {
 	c.q.reset()
 	c.resetState()
-	c.nodeStack = c.nodeStack[:0]
 	c.ensureRoot()
 }
 

io/router/pointer_test.go

@@ -1097,6 +1097,18 @@ func TestTransfer(t *testing.T) {
 	})
 }
 
+func TestDeferredInputOp(t *testing.T) {
+	var ops op.Ops
+
+	var r Router
+	m := op.Record(&ops)
+	key.InputOp{Tag: new(int)}.Add(&ops)
+	call := m.Stop()
+
+	op.Defer(&ops, call)
+	r.Frame(&ops)
+}
+
 // offer satisfies io.ReadCloser for use in data transfers.
 type offer struct {
 	data   string