f32: replace Affine2D{} with AffineId() for identity transformations

References: https://todo.sr.ht/~eliasnaur/gio/655
Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
Signed-off-by: Elias Naur <mail@eliasnaur.com>

io/input/key.go

@@ -281,6 +281,7 @@ func (q *keyQueue) Focus(handlers map[event.Tag]*handler, state keyState, focus
 		return state, nil
 	}
 	state.content = EditorState{}
+	state.content.Selection.Transform = f32.AffineId()
 	var evts []taggedEvent
 	if state.focus != nil {
 		evts = append(evts, taggedEvent{tag: state.focus, event: key.FocusEvent{Focus: false}})

io/input/pointer.go

@@ -144,7 +144,9 @@ const (
 )
 
 func (c *pointerCollector) resetState() {
-	c.state = collectState{}
+	c.state = collectState{
+		t: f32.AffineId(),
+	}
 	c.nodeStack = c.nodeStack[:0]
 	// Pop every node except the root.
 	if len(c.q.hitTree) > 0 {

io/input/router.go

@@ -779,13 +779,15 @@ func (q *Router) collect() {
 	pc.Reset()
 	kq := &q.key.queue
 	q.key.queue.Reset()
-	var t f32.Affine2D
+	t := f32.AffineId()
 	for encOp, ok := q.reader.Decode(); ok; encOp, ok = q.reader.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
 		case ops.TypeSave:
 			id := ops.DecodeSave(encOp.Data)
 			if extra := id - len(q.savedTrans) + 1; extra > 0 {
-				q.savedTrans = append(q.savedTrans, make([]f32.Affine2D, extra)...)
+				for range extra {
+					q.savedTrans = append(q.savedTrans, f32.AffineId())
+				}
 			}
 			q.savedTrans[id] = t
 		case ops.TypeLoad: