io/pointer: delete Foremost priority

It wasn't used, and it's not clear that it is useful at all in its current
form. For example, a single control with multiple handler keys (say, one for
scrolling and one for clicking) will only receive priority Foremost for one of
them.

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

app/internal/input/pointer.go

@@ -236,14 +236,11 @@ func (q *pointerQueue) Push(e pointer.Event, events *handlerEvents) {
 	if e.Type == pointer.Release {
 		q.pointers = append(q.pointers[:pidx], q.pointers[pidx+1:]...)
 	}
-	for i, k := range p.handlers {
+	for _, k := range p.handlers {
 		h := q.handlers[k]
 		e := e
-		switch {
-		case p.pressed && len(p.handlers) == 1:
+		if p.pressed && len(p.handlers) == 1 {
 			e.Priority = pointer.Grabbed
-		case i == 0:
-			e.Priority = pointer.Foremost
 		}
 		e.Hit = q.hit(h.area, e.Position)
 		e.Position = h.transform.Invert().Transform(e.Position)

io/pointer/doc.go

@@ -95,8 +95,8 @@ For multiple grabbing handlers, the foremost handler wins.
 Priorities
 
 Handlers know their position in a matching set of a pointer through
-event priorities. The Shared and Foremost priorities are for matching sets
-with multiple handlers; the Grabbed priority indicate exclusive access.
+event priorities. The Shared priority is for matching sets with
+multiple handlers; the Grabbed priority indicate exclusive access.
 
 Priorities are useful for deferred gesture matching.
 

io/pointer/pointer.go

@@ -112,9 +112,6 @@ const (
 	// Shared priority is for handlers that
 	// are part of a matching set larger than 1.
 	Shared Priority = iota
-	// Foremost is like Shared, but the handler is
-	// the foremost in the matching set.
-	Foremost
 	// Grabbed is used for matching sets of size 1.
 	Grabbed
 )
@@ -187,8 +184,6 @@ func (p Priority) String() string {
 	switch p {
 	case Shared:
 		return "Shared"
-	case Foremost:
-		return "Foremost"
 	case Grabbed:
 		return "Grabbed"
 	default: