NFR-RES-3 — No rendering while idle on Android, and battery-saver honoured #59

New Issue

2026-09-19T10:20:55Z

dtourolle commented

2026-09-19 10:20:55 +00:00

On Android the app shall not render continuously when idle; background sync respects metered-connection and battery-saver settings. Untagged, and nothing measures it.

Why

A tablet in a bag with the app in the foreground is the common case after a cull, and a Slint window that redraws every frame is a warm tablet with a flat battery by morning. FR-NC-6's unmetered/charging constraints exist for transfers; this clause is the same discipline for the render loop and for sync scheduling.

Deliverable

Confirm and pin the redraw policy: no frame is drawn without a state change (Slint's default) — and no timer, animation or polling keeps one coming. A test that counts frames over an idle interval.
Sync and the indexing sweeps read the platform's battery-saver and metered state and hold under either; the job runner already has the queue, this is the gate.
The thermal signal: back off the sweeps under onTrimMemory-class pressure or thermal throttling, and say so in the log.

Acceptance

Idle frame count over 60 s is zero on the reference tablet
Sync and sweeps do not run under battery saver or on a metered network unless the user overrode it
TRACES: NFR-RES-3 on the redraw test and the scheduling gate

**On Android the app shall not render continuously when idle; background sync respects metered-connection and battery-saver settings.** Untagged, and nothing measures it. ## Why A tablet in a bag with the app in the foreground is the common case after a cull, and a Slint window that redraws every frame is a warm tablet with a flat battery by morning. FR-NC-6's unmetered/charging constraints exist for transfers; this clause is the same discipline for the render loop and for sync scheduling. ## Deliverable - Confirm and pin the redraw policy: no frame is drawn without a state change (Slint's default) — and no timer, animation or polling keeps one coming. A test that counts frames over an idle interval. - Sync and the indexing sweeps read the platform's battery-saver and metered state and hold under either; the job runner already has the queue, this is the gate. - The thermal signal: back off the sweeps under `onTrimMemory`-class pressure or thermal throttling, and say so in the log. ## Acceptance - [ ] Idle frame count over 60 s is zero on the reference tablet - [ ] Sync and sweeps do not run under battery saver or on a metered network unless the user overrode it - [ ] `TRACES: NFR-RES-3` on the redraw test and the scheduling gate

dtourolle added the unmet-requirement size:M android performance labels 2026-09-19 10:20:55 +00:00

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Reference: dtourolle/DarkRoom#59