perf(web): stop rendering hidden terminals

[leoisadev1]

Problem

Hidden Ghostty canvases still snapshot, paint, and blink. Settings font previews and any mounted drawer keep doing that work while display:none.

Changes

Pause canvas paint, snapshots, and cursor timers when a surface is hidden or zero-size. Keep parsing output and answering VT queries. Reveal refits and repaints in full. The dormant drawer now forwards its existing visible flag into the surface.

Adapted from pingdotgg#9718. ChatView was not restored. Upstream WASM headless tests were left out because this Vitest setup cannot load Ghostty WASM.

Scope

This PR is hidden-terminal rendering only.

Covered here:

• perf(web): stop rendering hidden terminals pingdotgg/t3code#9718 stop rendering hidden terminals

Still assigned to this handoff, in later PRs:

• faster Ghostty snapshots (perf(web): speed up terminal snapshots pingdotgg/t3code#9663)
• avoid repeated terminal metadata scans (perf(web): avoid repeated terminal metadata scans pingdotgg/t3code#9747)
• terminal input (feat(mobile): paste the phone clipboard into the terminal pingdotgg/t3code#9199 fix(web): copy terminal selection with Ctrl+Insert pingdotgg/t3code#8541 fix(web): middle-click pastes in the terminal on Linux pingdotgg/t3code#11018 fix(web): honor terminal link browser overrides pingdotgg/t3code#10060)

Verification

• vp test run apps/web/src/terminal/ghostty/surface.test.ts apps/web/src/components/ThreadTerminalDrawer.test.ts: 50 passed.
• vp lint on the two files: clean.

Native Electron paint while a drawer is hidden was not run on this Linux host.

Implemented and verified by Grok 4.6 High in Grok Build via Orca.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
akeru-bot-landing	Skipped		Sep 10, 2026 6:23pm UTC

[greptile-apps]

Greptile Summary

This change pauses Ghostty canvas rendering, snapshots, cursor timers, fitting, and focus while terminal surfaces are hidden or have no measurable size, while continuing to parse terminal output. When a terminal becomes visible again, it performs a complete fit and repaint.

Confidence Score: 5/5

Safe to merge.

No outstanding issues were identified.

Files Needing Attention: None.

_{Reviews (2): Last reviewed commit: "Merge branch 'main' into perf/web-hidden..." | Re-trigger Greptile}