FA-34175 / Notification interfaces / Member archive

Visual notification delivery acknowledgement: retry-mount from undisplayed · case 05

The retry-mount event leaves a notification in ack-pending instead of mounting.

Member previewVariant 5 · 3 implementations · 40 checks per implementation

Case contract

Visual notification delivery acknowledgement is a bounded visual-notification workflow with mutable policy state {'mount': 4, 'painted': False, 'acknowledged': False, 'ack_attempts': 0}. Its default transition relation is {('received', 'mount-request'): 'mounting', ('mounting', 'paint-confirmed'): 'ack-pending', ('mounting', 'mount-failed'): 'undisplayed', ('ack-pending', 'ack-success'): 'seen', ('ack-pending', 'ack-failure'): 'ack-retry', ('ack-retry', 'retry-ack'): 'ack-pending', ('undisplayed', 'retry-mount'): 'mounting', ('seen', 'delivery-replay'): 'seen', ('mounting', 'route-unmount'): 'undisplayed', ('ack-retry', 'surface-unmount'): 'ack-retry'}; domain inputs can suppress or redirect transitions and update policy fields, as specified in solve. Different-generation events are inert. Batches apply in order. Optional observe returns the selected policy field alongside the phase.

Why this case matters

Visual notification lifecycle ordering can leave an inbox or toast showing the wrong actionable state even when transport succeeds.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
undisplayed / retry-mount	`"ack-pending"`	`"mounting"`	Failed

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