Upgrade MyGo to v0.5.5

Elements are now pass-scoped value handles: tests that read bounds
after a frame bind a ui.Handle. pixel tells frames apart by the build
pass's root, since the Tester clock no longer moves on its own.

Fix the regressions the upgrade brought:
- Clipboard reads in input handlers go through c.Services().
- MyGo notes an overlay's opener after building it, so AutoFocus
  inside lost it; pixel.AutoFocus focuses through a Handle, and
  archtest bans the raw call. Dialogs hand the focus back again.
- Elements around a press stay hovered: Tooltip tells a press-given
  focus by focus arriving under the pointer.
- The web host moves the Tester clock with real time, at most 500 ms
  a call, and gives components the real clock.

The gallery's source index also accepts CRLF checkouts.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

media/audioplayer.go

@@ -24,7 +24,7 @@ type AudioPlayerOptions struct {
 }
 
 type AudioPlayerResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Changed is play, seek or volume; others are presses.
 	Changed, Stopped, Previous, Next bool
 }

media/cartridge.go

@@ -17,7 +17,7 @@ type CartridgeOptions struct {
 }
 
 // Cartridge is a game cart with a sticker: art, title.
-func Cartridge(c *ui.Context, text string, o CartridgeOptions) *ui.Element {
+func Cartridge(c *ui.Context, text string, o CartridgeOptions) ui.Element {
 	k := pixel.K(c)
 	if o.Art != nil && (o.Art.W > 38 || o.Art.H > 22) {
 		panic("media: Cartridge Art is larger than 38 by 22")

media/cassette.go

@@ -19,7 +19,7 @@ type CassetteOptions struct {
 }
 
 // Cassette turns its reels while playing; tape winds right.
-func Cassette(c *ui.Context, text string, o CassetteOptions) *ui.Element {
+func Cassette(c *ui.Context, text string, o CassetteOptions) ui.Element {
 	k := pixel.K(c)
 	if !(o.Progress >= 0 && o.Progress <= 1) {
 		panic(fmt.Sprintf("media: Cassette Progress %v outside 0–1", o.Progress))

media/equalizer.go

@@ -17,7 +17,7 @@ type EqualizerOptions struct {
 }
 
 type EqualizerResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Band is the band changed this frame, else -1.
 	Band int
 }

media/filmstrip.go

@@ -12,7 +12,7 @@ type FilmstripOptions struct {
 }
 
 // Filmstrip lays a sprite's frames on film with sprocket holes.
-func Filmstrip(c *ui.Context, text string, sp *pixel.Sprite, o FilmstripOptions) *ui.Element {
+func Filmstrip(c *ui.Context, text string, sp *pixel.Sprite, o FilmstripOptions) ui.Element {
 	k := pixel.K(c)
 	s := scale("Filmstrip", o.Scale, 2)
 	n := sp.Frames()

media/gallery.go

@@ -16,7 +16,7 @@ type GalleryOptions struct {
 }
 
 type GalleryResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/imagecompare.go

@@ -18,7 +18,7 @@ type ImageCompareOptions struct {
 }
 
 type ImageCompareResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/media.go

@@ -39,7 +39,7 @@ func scale(name string, s, def int) int {
 }
 
 // art is a named picture w by h dots.
-func art(c *ui.Context, k pixel.Kit, label string, w, h int) *ui.Element {
+func art(c *ui.Context, k pixel.Kit, label string, w, h int) ui.Element {
 	if label == "" {
 		panic("media: a picture needs a name")
 	}
@@ -75,7 +75,7 @@ type turn struct {
 }
 
 // turned counts steps while playing; stopped, it holds still.
-func turned(c *ui.Context, k pixel.Kit, e *ui.Element, playing bool, fps int) int {
+func turned(c *ui.Context, k pixel.Kit, e ui.Element, playing bool, fps int) int {
 	s := ui.Local(e, turnKey{}, func() turn { return turn{} })
 	on := playing && !k.Reduce()
 	if on {

media/notes.go

@@ -25,7 +25,7 @@ func note(semi int) string {
 }
 
 // played are the semitones whose letters e heard this frame.
-func played(e *ui.Element) []int {
+func played(e ui.Element) []int {
 	var out []int
 	for semi, kb := range keyboard {
 		if pixel.Shortcut(e, 0, kb.key) {

media/pianokeys.go

@@ -14,7 +14,7 @@ type PianoKeysOptions struct {
 }
 
 type PianoKeysResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Struck are notes begun this frame, like "C#4".
 	Struck []string
 }
@@ -36,7 +36,7 @@ var (
 // PianoKeys plays C4–C5 by pointer, A–K and WETYU.
 func PianoKeys(c *ui.Context, text string, o PianoKeysOptions) PianoKeysResult {
 	k := pixel.K(c)
-	shell, base, st := pixel.Shell(c, func() *ui.Element {
+	shell, base, st := pixel.Shell(c, func() ui.Element {
 		return ui.Box(c).Focusable().Role(ui.RoleGroup).Label(text).Disabled(o.Disabled)
 	})
 	hd := ui.Local(base, pianoKey{}, func() hand { return hand{held: -1, typed: -1} })

media/playlist.go

@@ -17,7 +17,7 @@ type PlaylistOptions struct {
 }
 
 type PlaylistResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Submitted is Enter or a double click on a row.
 	Changed, Submitted bool
 }

media/recordbutton.go

@@ -15,7 +15,7 @@ type RecordButtonOptions struct {
 }
 
 type RecordButtonResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/scrubber.go

@@ -18,7 +18,7 @@ type ScrubberOptions struct {
 }
 
 type ScrubberResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/stepsequencer.go

@@ -18,7 +18,7 @@ type StepSequencerOptions struct {
 }
 
 type StepSequencerResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 	// Step is the playhead, 0–15, or -1 when stopped.
 	Step int

media/tracker.go

@@ -23,7 +23,7 @@ type TrackerOptions struct {
 }
 
 type TrackerResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/transport.go

@@ -15,7 +15,7 @@ type TransportOptions struct {
 }
 
 type TransportResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Changed is play or pause; the rest are presses.
 	Changed, Stopped, Previous, Next bool
 }

media/tuner.go

@@ -15,7 +15,7 @@ type TunerOptions struct {
 }
 
 type TunerResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/videoframe.go

@@ -19,7 +19,7 @@ type VideoFrameOptions struct {
 }
 
 type VideoFrameResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Changed is play, pause or a seek.
 	Changed bool
 }

media/vinyl.go

@@ -13,7 +13,7 @@ type VinylOptions struct {
 }
 
 // Vinyl turns a record while playing; the arm swings on.
-func Vinyl(c *ui.Context, text string, o VinylOptions) *ui.Element {
+func Vinyl(c *ui.Context, text string, o VinylOptions) ui.Element {
 	k := pixel.K(c)
 	e := art(c, k, text, 72, 64)
 	swing := float64(k.Toward(c, e, o.Playing, 12, 6)) / 6

media/visualizer.go

@@ -16,7 +16,7 @@ type VisualizerOptions struct {
 }
 
 // Visualizer mirrors each level, 0 to 1, about the middle.
-func Visualizer(c *ui.Context, text string, levels []float64, o VisualizerOptions) *ui.Element {
+func Visualizer(c *ui.Context, text string, levels []float64, o VisualizerOptions) ui.Element {
 	k := pixel.K(c)
 	if len(levels) == 0 {
 		panic("media: Visualizer has no levels")

media/volume.go

@@ -18,7 +18,7 @@ type VolumeOptions struct {
 }
 
 type VolumeResult struct {
-	Element *ui.Element
+	Element ui.Element
 	Changed bool
 }
 

media/waveform.go

@@ -15,7 +15,7 @@ type WaveformOptions struct {
 }
 
 // Waveform draws samples, ±1, as lines from the middle.
-func Waveform(c *ui.Context, text string, samples []float64, o WaveformOptions) *ui.Element {
+func Waveform(c *ui.Context, text string, samples []float64, o WaveformOptions) ui.Element {
 	k := pixel.K(c)
 	if len(samples) == 0 {
 		panic("media: Waveform has no samples")