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fix(web): iPhone keyboard no longer hides the composer or scrolls the header away - #19513

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Trevor-Compaytence wants to merge 4 commits into
pingdotgg:mainfrom
Trevor-Compaytence:fix/web-ios-keyboard-shell
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Trevor-Compaytence wants to merge 4 commits into
pingdotgg:mainfrom
Trevor-Compaytence:fix/web-ios-keyboard-shell

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Problem

Fixes #19512. iOS Safari ignores interactive-widget=resizes-content, so when the keyboard opens on an iPhone only visualViewport shrinks and Safari pans the page. The header scrolls off the top and the composer's bottom row lands behind the keyboard, because the shell and route insets are sized with h-dvh/h-svh.

Change

On portrait touch phones ((max-width: 639px) and (pointer: coarse)), useVisualViewportSync writes the visual viewport's height and pan offset to <html> and sets data-viewport-sync, plus data-keyboard-open once more than 120px is lost. It updates on visualViewport resize/scroll and window resize and stands down while pinch-zoomed. CSS keyed on those attributes:

  • pins the sidebar wrapper (position: fixed) to the visible area below the top safe area. contain: layout keeps the header's fixed toggles inside it;
  • sizes sidebar-inset to that area instead of h-dvh/h-svh, so every route gets it;
  • keeps the portaled mobile drawer on the visible area, with its toggle aligned to the main one;
  • locks html/body scrolling only while the shell is pinned (pairing/auth routes are unaffected);
  • caps the editor at min(13rem, 40%) of the visible height and drops the bottom safe-area gap while the keyboard is open.

The timeline is unchanged: the existing scroll anchoring keeps a reader at the newest message as its container shrinks. Desktop, narrow mouse windows, and landscape phones keep their current layout.

Scope and approval

Bug fix for #19512, filed alongside this PR. It has not been triaged yet. All changes serve the one problem of keeping the shell on the visible area when the iOS keyboard opens.

Verification

  • vp test run src/hooks/useVisualViewportSync.test.ts --project unit (apps/web): 12 passed. Covers measurement (no keyboard, iOS overlay, iOS pan, Chromium resize, toolbar collapse, pinch-zoom) and hook lifecycle (repeated keyboard cycles, rotation, scroll-only pan, cleanup on disable/unmount/zoom).
  • tsc-rs --noEmit in apps/web passes; vp fmt --check and vp lint are clean on the changed files.
  • Chrome iPhone emulation (iOS UA, touch, DPR 3) at 360x780, 390x844 and 430x932 against a local dev server, with a 336px keyboard simulated by stubbing window.visualViewport and panning the page as Safari does. Before: header at y = -279, composer bottom 41px behind the keyboard. After: header at y = 0 to 52 and the form bottom 8px above the keyboard at all three widths, with no horizontal scroll. A nine-line prompt scrolls inside the editor.
  • data-viewport-sync stays off at 600x800 and 1280x800 with a mouse.
  • Not checked: a real iPhone. Emulation cannot reproduce the OS keyboard, Safari's actual pan, or a nonzero safe-area-inset-top in standalone mode.
Before After
Keyboard open, 390
Multiline, 390
Keyboard open, 360

Done with Claude Opus 5.5 in Claude Code (via T3 Code), reviewed by Codex.

🤖 Generated with Claude Code

Trevor-Compaytence and others added 3 commits October 14, 2026 10:53
… header away

iOS Safari ignores interactive-widget=resizes-content, so opening the keyboard
only shrinks the visual viewport and pans the page. The header scrolled off and
the composer sat behind the keyboard. On phones the app shell now follows
visualViewport height and offset, so the header stays put and the composer sits
on the keyboard while the timeline shrinks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Limit viewport sync to portrait touch phones so narrow desktop windows and
landscape phones keep their existing layout, and only drop the composer's
bottom safe-area gap when the keyboard is actually open.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@github-actions github-actions Bot added vouch:unvouched PR author is not yet trusted in the VOUCHED list. size:L 100-499 changed lines (additions + deletions). labels Oct 14, 2026
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Reviewing files that changed from the base of the PR and between c30c5ae and b29670b.

📒 Files selected for processing: 2
  • apps/web/src/hooks/useMediaQuery.test.ts
  • apps/web/src/hooks/useMediaQuery.ts
🚧 Files skipped from review as they are similar to previous changes: 1
  • apps/web/src/hooks/useMediaQuery.ts

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📝 Walkthrough

The web app now detects phone viewports and synchronizes visual viewport measurements. CSS uses those measurements and keyboard state to adjust the app shell, sidebar, and composer.

Changes: Mobile viewport and keyboard layout

Layer / File(s) Summary
Viewport measurement and synchronization
apps/web/src/hooks/useMediaQuery.ts, apps/web/src/hooks/useMediaQuery.test.ts, apps/web/src/hooks/useVisualViewportSync.ts, apps/web/src/hooks/useVisualViewportSync.test.ts
Adds a phone-viewport check and a hook that measures visual viewport dimensions, updates document properties and attributes, and clears them when synchronization ends or is unavailable. Tests cover viewport detection, measurement, keyboard cycles, and cleanup.
Viewport-based shell and composer layout
apps/web/src/components/AppSidebarLayout.tsx, apps/web/src/index.css, apps/web/src/components/sidebar/SidebarChrome.tsx, apps/web/src/components/ChatView.tsx
AppSidebarLayout enables synchronization for phone viewports. CSS uses synchronized dimensions and keyboard state to adjust document scrolling, shell and sidebar placement, and composer sizing. Sidebar trigger positioning and composer spacer markup are updated.

Priority: ⬆️ High

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: High

Merge Risk: ⚪ Minimal · up to b2967

The reviewed layout changes have no identified merge-blocking issue; normal checks can proceed.

Pre-merge checks: Passed 4
Passed Passed checks: 4 passed
Check name Status Explanation
Title check Passed The title clearly and concisely describes the primary fix for the iPhone keyboard behavior.
Description check Passed The description includes the required Problem, Change, Scope and approval, and Verification sections. It explains the affected behavior, implementation, testing, screenshots, and known limitation that…
Linked Issues check Passed The changes satisfy the coding requirements in [#19512]. useVisualViewportSync tracks visual viewport height and pan offset, updates on viewport and window events, and writes synchronized state to `…
Out of Scope Changes check Passed The changed hook, media-query helper, shell integration, sidebar and drawer positioning, composer spacer, CSS, and tests directly support [#19512]. The portrait touch-phone condition preserves existin…
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Actionable comments posted: 2


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @apps/web/src/hooks/useMediaQuery.ts:
- Around line 90-91: Update useIsPhoneViewport to exclude landscape phones using
an orientation signal based on the screen rather than the resizable viewport, so
opening the keyboard cannot change the result; keep the existing coarse-pointer
and width conditions.

Review comments at @apps/web/src/index.css:
- Around line 2378-2387: Update the `html[data-viewport-sync]` styles for
`[data-sidebar-control]` so its top position follows the pinned shell’s
`app-viewport-offset-top` plus the safe-area inset when viewport sync is active.
Keep the change scoped to the global mobile sidebar control.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7ac952c and c30c5ae.

📒 Files selected for processing: 7
  • apps/web/src/components/AppSidebarLayout.tsx
  • apps/web/src/components/ChatView.tsx
  • apps/web/src/components/sidebar/SidebarChrome.tsx
  • apps/web/src/hooks/useMediaQuery.ts
  • apps/web/src/hooks/useVisualViewportSync.test.ts
  • apps/web/src/hooks/useVisualViewportSync.ts
  • apps/web/src/index.css

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Comment thread apps/web/src/hooks/useMediaQuery.ts Outdated
Comment thread apps/web/src/index.css
A coarse-pointer phone under 640px wide in landscape still matched the
phone query, so it got the pinned shell and the document scroll lock.
The check now also requires a portrait screen. It reads
screen.orientation rather than an (orientation: portrait) query,
because with interactive-widget=resizes-content an Android keyboard can
make the viewport wider than tall and would switch the sync off
mid-typing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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[Bug]: iOS Safari keyboard hides the web composer and scrolls the header off-screen

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