iOS: scroll down --until stops before the end on SwiftUI List (0 passes) and ScrollView

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Bewertung

Schwierigkeit
4/5
Geschätzter Aufwand
3-5 Tage
Anfängerfreundlichkeit
70/100
Issue-Typ
Bug
Klarheit
Klar beschrieben
Aktivitätsstatus
Aktiv
Tech-Stack
ios, swift, typescript
Bereich
mobile, testing

Rechercherichtung

Start by tracing the iOS scroll down --until path through scroll_until_edge_reached and how it reads accessibility snapshots for scrollable content. Use the linked reproduction app and its list.ad, sheet.ad, and scrollview.ad replays to compare the three cases. Done means the selector becomes visible before stopping, or scrolling stops only when content truly stops moving.

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Beschreibung

bug ready-for-agent

On iOS, scroll down --until '<selector>' gives up on SwiftUI lists that plain scroll down scrolls through fine.

Repro: https://github.com/antFrancon/agent-device-scroll-until-repro (./repro.sh [version]). It's a one-file SwiftUI app showing the same 64 rows three ways, with one .ad per way, each running scroll down --until 'id="row-60"'.

Replay Rows in Result
list.ad a List, pushed fails after 0 passes: "scroll down reached the end of the scrollable content … without id="row-60" becoming visible"
sheet.ad the same List in a .sheet fails after 0 passes, same message
scrollview.ad a ScrollView + LazyVStack, pushed fails after 3 passes, same message, with rows 53–63 still below

Plain scroll down reaches row-60 in all three: 7 flings for the list, 8 for the sheet, 4 for the scroll view.

Likely cause for the List: it reaches the snapshot as [collection] with no [scrollable], so --until sees no scrollable content and never swipes (scroll_until_edge_reached, passes: 0, nothing dispatched). The ScrollView is [scroll-area] [scrollable], but end detection still trips one pass early.

Expected: --until keeps scrolling until the selector is visible or the content truly stops moving.

Seen on: agent-device 0.21.28, 0.21.36 and 0.21.37-nightly.20261103.128 (identical results) · iOS 26.5 simulator, iPhone 16 · Xcode 27.2 (27B52) · macOS 27.0 · Node 22.22.1

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TypeScript
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