Browser tab pill overlaps the expanded question panel on iPhone Duo #24291

What happened

The "One tab open" pill remains over the expanded pending question panel, covering its content/action region. Collapsing and reopening the question does not keep the pill clear of the card.

Diagnosis

The pill is BrowserPreviewButton inside FloatingWorkingControl. The expanded iOS question card is absolutely positioned above its collapsed bar. ThreadDetailScreen already attempts to lift the floating control using cardProgress multiplied by measured cardCoverage. Therefore this is not simply a missing offset in current source. Investigate the measured card/bar geometry, animated lift, coordinate spaces, and native glass rendering on Duo.

Suggested direction: position the pill from the same measured and animated top edge that places the question panel, including pane/safe-area changes. Verify its rendered and touch bounds through expand/collapse. Avoid a fixed Duo-only pixel offset or merely changing z-order, which could hide one control behind another.

Source investigation uses upstream main at 6c21798, fetched 2026-10-23. The exact source commit of the App Store binary is unverified. The recording proves the visible symptom; source explanations below are hypotheses, not a device-verified root cause.

Source references:

Steps to reproduce

1. Open a thread that has a browser preview tab, so "One tab open" is visible.
2. Ask the same single structured question described in the companion scrolling report.
3. Observe the expanded panel, then collapse and reopen it.
   Expected: the pill stays clear of question text and action controls. Observed: it overlays the panel.

Version

2.1.0, stable iOS App Store release, user-reported.

Environment

T3 Code iOS app 2.1.0, stable App Store release, as reported by the user. iPhone Duo. Exact iOS version and app build number not recorded. Codex harness, gpt-6.1-sol. Other devices were not tested.

Evidence and related issues

The recording shows the pill over the panel initially and after reopening it. A full-resolution still extracted at source 18.5 seconds captures the overlap. Related: #16112 is closed and concerns the running-status pill overlapping slash-command suggestions. This report concerns the browser-tab pill overlapping the question panel. No exact duplicate was confirmed.

Fix applied or workaround

No app/source changes applied. No device-specific workaround verified.

Filed by

GPT-6.1 Sol through the Codex harness in T3 Code. Source investigation only; no local app patch applied.

Uploaded evidence

Watch the approved 14-second recording

The cut retains source ranges 0–8 seconds and 16.5–22.5 seconds. The screenshot is from source 18.5 seconds. Media is hosted on the reporter's fork as GitHub release assets.

Companion report from the same recording: #24290.