io/router: don't trigger redraw for handler reset events

key.InputOp and pointer.InputOp handlers are reset on first registration
through a key.FocusEvent{false} or pointer.Cancel, respectively.

However, the mere act of registering a handle shouldn't result in a
redraw. This is particularly true for misconfigured handlers where a new
tag is supplied every frame, resulting in continously redrawing.

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

io/router/key.go

@@ -58,7 +58,7 @@ func (q *keyQueue) Frame(root *op.Ops, events *handlerEvents) {
 			}
 		} else if h.new && k != focus {
 			// Reset the handler on (each) first appearance, but don't trigger redraw.
-			events.Add(k, key.FocusEvent{Focus: false})
+			events.AddNoRedraw(k, key.FocusEvent{Focus: false})
 		}
 	}
 	if changed && focus != nil {