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A declared capability set REPLACES the per-platform baseline rather than
merging with it, so anything the baseline grants and the player omits is a
control the operator loses by updating. Three were being lost.
- display.brightness: the per-window dim (setWindowBrightness) is Tier 0 —
no permission, no owner, no WRITE_SETTINGS — and MainActivity applies it
unconditionally. It was simply never declared.
- remote.screenshot / remote.stream: gated on the accessibility service,
while captureScreen() falls through to ScreenshotCapture.captureView,
a plain view draw with no permission check. A Tier-0 panel lost live view
and screenshots by updating, and a GRANTED MediaProjection never became a
capability either — consent given, capture working, server still refusing,
because nothing re-declared.
- system.device_owner: no player declared it, so the server accepted
system.kiosk as a stand-in for every Tier-2 command. Declaring the
canonical name makes refusals say what they mean; the stand-in can retire
one release after this reaches displays.
display.power stays conditional on purpose: screen_on works anywhere via a
wake lock but screen_off needs owner/admin/accessibility, and a control that
sleeps a panel it cannot wake is worse than no control. It is the sole entry
in the DELIBERATE set in player-parity-baselines.test.js.
Also fixes the capture-bootstrap gate in device-detail.js. It hung off
can('remote.screenshot'), which hid the button from exactly the panels that
need it. The gate is now Android-and-nothing-else, NOT "Android that lacks
capture": /api/devices/:id ships capabilitiesFor(), which flattens declared
and baseline into one array, and the android baseline contains
remote.screenshot — so a "lacks capture" test hides the button from all ~440
undeclared panels in the field. isAndroidDevice() mirrors platformFamily()
with all four signals in order; an Android-test-only helper classified every
Tizen TV as Android, since Tizen registers android_version 'Tizen 6.5'.
Tests: the suite could not see any of this. Mutation testing showed deleting
either capability line, or reverting isAndroidDevice to its buggy form, left
all tests green. Added an update-invariant test (declared set vs baseline,
with an argued exception list), a test that executes the shipped helper
rather than the harness stub, and a legacy-panel test using the shape the API
actually returns instead of one it never produces. All four mutations now
fail.
Verified on a real Android 16 device across all three tiers: Tier 0 captures
live video (no accessibility, no MediaProjection, no owner), Tier 1 gains
display.power via accessibility, Tier 2 declares system.device_owner and every
Tier-2 command delivers. An in-place upgrade from the pre-change build lost
nothing and gained exactly these three.
Baselines deliberately NOT moved — a baseline entry moves in the release
AFTER the one carrying the player fix, once it has reached displays.
Parity gaps 3 and 4 were implemented, audited and reverted; docs/player-parity.md
records why so the next attempt starts from the traps. Gap 3 (wiring "Force
update") meets an unbounded synchronous download against a 120s watchdog and a
3-attempt counter with no version binding, so three presses refuse a panel every
future version. Gap 4 (deferring to BS.capabilities()) removes working
screenshot/stream from diskless BrightSigns that capture to RAM, over-declares
transitions, and rides a probe timeout that discards a late answer permanently.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A
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|---|---|---|
| .. | ||
| activity.js | ||
| admin-player-debug.js | ||
| admin.js | ||
| billing.js | ||
| content-library.js | ||
| dashboard.js | ||
| designer.js | ||
| device-detail.js | ||
| force-password-change.js | ||
| help.js | ||
| kiosk.js | ||
| layout-editor.js | ||
| login.js | ||
| no-workspace.js | ||
| onboarding.js | ||
| playlists.js | ||
| reports.js | ||
| schedule.js | ||
| settings.js | ||
| teams.js | ||
| video-wall.js | ||
| widgets.js | ||
| workspace-members.js | ||