The CSI fast-path check previously ran on every byte of input, causing
3-18% regressions on ESCAPE, OSC, DCS, and other non-CSI sequences.
Moving the check into the CLEAR action handler means it only evaluates
after the state machine already identified an ESC byte. The fast-path
body is extracted into a separate _csiFast method to keep the switch
case body small for V8 optimization.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Three related disposable-registration gaps that leak xterm Terminal
instances when the host application unmounts a Terminal. Evidence +
full writeup at juspay/kolu#606.
1. addon-webgl/WebglRenderer._cursorBlinkStateManager was declared
`= new MutableDisposable()` without the `this._register(...)`
wrapper that every sibling MutableDisposable in the class uses.
CursorBlinkStateManager runs a setInterval for the cursor blink
and its `dispose()` correctly clears it — but dispose() was never
called because the disposable wasn't registered. The live timer
kept the renderer (and thus the Terminal) alive past host
unmount.
2. common/TaskQueue.DebouncedIdleTask had no `dispose()` method.
Added one that clears the internal IdleTaskQueue (cancelling any
pending idle callback).
3. browser/services/RenderService._pausedResizeTask (a
DebouncedIdleTask) was not registered. Wrapped with
`this._register(...)` so RenderService.dispose propagates.
Verified in a downstream app (kolu) with a repro that toggles Focus
vs Canvas layout modes:
- Pre-fix: 24/28 disposed xterm Terminals retained past host unmount
+ forced GC.
- Post-fix: 0/28 retained.
Retention chain (before fix):
DOMTimer → ScheduledAction → V8Function
→ CursorBlinkStateManager._renderCallback → WebglRenderer
→ Terminal
Terminal.resize() already no-ops internally when dimensions haven't
changed. The addon's guard prevented resize() from being called at all,
forcing callers using ResizeObserver-based layouts to use perturbation
workarounds (resize to rows-1, then fit) that race with the observer.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace `window` with `globalThis` in IdleTaskQueue export.
In Bun and Deno, `isNode` is false but `window` is undefined, causing
a ReferenceError. Using `globalThis` is safe in all JS runtimes and
makes the `isNode` guard unnecessary.
This is the only `in window` expression in code bundled into
@xterm/headless.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Defer Viewport DOM scroll updates while DEC 2026 synchronized output is
active, then flush once rendering resumes so DOM and canvas update
atomically.
Also update demo sizing to avoid relying on removed internal viewport
scrollBarWidth.
Disable desynchronized 2D canvas mode for image layers so resize paint stays synchronized and avoids blank-frame jitter on some platforms.
Signed-off-by: sergiochan <yuheng9211@qq.com>
Daniel Imms
Ismail PelaseyedandClaude Opus 4.6
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Sridhar Ratnakumar
Loïc Mangeonjean
Jeffrey Chen
dependabot[bot]
Anthony Kim
Anthony Kim
Per Bothner
Tyler VorpahlandClaude Opus 4.6
GaubeeandClaude Opus 4.6
mgabor3141
sergiochan