Fix iOS terminal grid resizing during keyboard content movement - #12276
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azooz2003-bit wants to merge 5 commits into
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Fix iOS terminal grid resizing during keyboard content movement#12276azooz2003-bit wants to merge 5 commits into
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📝 WalkthroughWalkthroughThe bottom safe-area resolver now prefers the window inset, then the captured outer inset, and uses the moving view inset as a fallback. Documentation and tests cover matching, fallback, zero-inset, and keyboard-movement behavior. ChangesSafe-area resolution
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Possibly related PRs
Merge Risk: 🟡 Moderate · up to Keyboard transitions can still destabilize terminal dimensions in a reachable fallback state, so the inset resolution should be corrected before merge. 🚥 Pre-merge checks | ✅ 23 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (23 passed)
Full details: Description checkExplanation The description provides detailed change context and testing evidence, but it omits the required Demo Video, Review Trigger, and Checklist sections. The UI behavior change therefore does not fully follow the repository template.
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Inline comments:
In
`@Packages/iOS/CmuxMobileTerminalKit/Sources/CmuxMobileTerminalKit/TerminalLetterboxGeometry.swift`:
- Around line 129-131: Update resolvedBottomSafeAreaInset to remove the
viewInset fallback; when windowInset and capturedInset are unavailable, return
the explicit unavailable state so geometry updates defer until ancestorInsets or
another outer safe-area source is available.
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📒 Files selected for processing (3)
Packages/iOS/CmuxMobileTerminal/Sources/CmuxMobileTerminal/GhosttySurfaceView.swiftPackages/iOS/CmuxMobileTerminalKit/Sources/CmuxMobileTerminalKit/TerminalLetterboxGeometry.swiftPackages/iOS/CmuxMobileTerminalKit/Tests/CmuxMobileTerminalKitTests/TerminalLetterboxGeometryTests.swift
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Typing with the iPhone keyboard visible could repeatedly resize the terminal grid, corrupt rows, or leave the viewport blank. The moving surface was supplying its own changing safe-area inset to the grid calculation. Prefer the stationary window inset, then the captured outer inset, so keyboard presentation cannot change terminal capacity.
Validation: the new regression test reproduces the observed 34pt/9pt inset sequence and 706pt/731pt container alternation before the fix. All 22 focused geometry tests pass after the fix, including four moving-surface cases. The test and fix are separate commits.
Visual acceptance completed on iPhone 17 Pro Max Simulator (iOS 26.5), paired Mac/iOS tag
t10s, source4908bc8b606. Ten real Codex prompts produced ten responses, with 30 full-viewport screenshots (before, after submission, settled) and 616.91 seconds of continuous video. All 30 stills and 14 transition contact sheets were inspected. No misplaced cursor, malformed terminal rows, blank viewport or repeated vertical oscillation was observed. All 13 recorded geometry updates stayed at 72x60; a 150-frame final idle window had 0 px input-band movement. Physical iPhone was not tested.Evidence is retained on the verification machine under
cmux-assets/feat-ios-terminal-wrap-stability/ten-prompts/index.html, with exact timestamps, executable hashes, transcript, native stack sample and failure artifacts. One visibility detail remains documented: prompt 5's model-status footer appears beneath the translucent accessory toolbar while its six input rows and cursor remain visible.Apple guidance: Layout, respecting system safe areas while adapting content. No deliberate HIG deviation or user-facing string changes.
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Medium Risk
Changes iOS terminal layout math for bottom safe-area reservation; wrong precedence could mis-seat the toolbar/grid under the home indicator, but behavior is covered by new unit tests.
Overview
Stops the terminal grid from chasing the sliding surface’s local safe-area inset during keyboard presentation, which was resizing/reflowing rows and feeding back into layout (row-count oscillation).
TerminalLetterboxGeometry.resolvedBottomSafeAreaInsetnow prefers the window inset, then the captured outer inset, and only uses the moving view’ssafeAreaInsets.bottomas a last resort before ancestor fallbacks.GhosttySurfaceViewcomments are aligned with that contract.Adds regression coverage that grid container height stays fixed when the surface reports varying local insets but outer sources still report the home-indicator inset.
Reviewed by Cursor Bugbot for commit 4908bc8. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Stops the iOS terminal from oscillating when a long typed line wraps. Two feedback loops caused vertical movement and cursor/row misalignment: each display-linked blank-band measurement retargeted a 0.2-second layout animation on the content cap, and the surface's own safe-area inset changing during keyboard motion resized the terminal grid. Sampled keyboard absorption changes now apply immediately, and grid insets resolve from the stationary outer layout, so a moving surface's local inset can't reflow the terminal. Keyboard show/hide seat transitions keep their animation.
Written for commit 4908bc8. Summary will update on new commits.
Summary by CodeRabbit