terminal becomes unreadable #4183

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1. aerioeus

   added

   bugSomething isn't workingSomething isn't working

   on May 7, 2026
2. github-actions commented on May 7, 2026

   

   github-actionsBot

   on May 7, 2026 – with GitHub Actions

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   Triage notes:

   This looks like a duplicate of the well-documented WebGL texture-atlas corruption issue affecting apps/desktop's xterm.js terminal. The "garbled / Klingon" symptom — characters render as wrong glyphs while structure (indentation, colors, layout) stays intact — matches several existing reports:

   • Terminal renders garbled characters (WebGL texture atlas corruption) #3794 — Terminal renders garbled characters (WebGL texture atlas corruption) — most detailed root-cause writeup
   • [bug] Intermittent garbled text rendering with multiple Claude Code tabs and Chinese content #3572 — Intermittent garbled text rendering with multiple Claude Code tabs and Chinese content
   • [bug] Terminal Output Corruption (Garbled CJK Characters) and Layout Glitches during Heavy Usage #3527 — Terminal Output Corruption (Garbled CJK Characters) and Layout Glitches during Heavy Usage
   • [bug] macOS terminal rendering can corrupt and ghost into chat until fullscreen toggle #3504 — macOS terminal rendering can corrupt and ghost into chat until fullscreen toggle
   • [bug] Terminal intermittently renders English text as RTL-looking gibberish #4010 — Terminal intermittently renders English text as RTL-looking gibberish
   • [bug] Sometimes the displayed Chinese characters are garbled. #3406, [bug] when focusing back on terminal, content gets corrupted #3208, [bug] Terminal can still repaint into a stale visual state after focus/workspace restore #3321, [bug] Claude code rendering issue in superset terminal #3668 — same symptom area

   Open PRs already targeting this:

   • fix: solve #4010 — clear WebGL texture atlas on terminal reattach/resize #4011 — clear WebGL texture atlas on terminal reattach/resize (closes [bug] Terminal intermittently renders English text as RTL-looking gibberish #4010)
   • fix: solve #3794 — allow opting out of WebGL terminal renderer #3796 / fix: allow disabling WebGL terminal renderer to prevent garbled text #3795 — allow opting out of the WebGL terminal renderer
   • fix(desktop): force WebGL repaint on load and fall back to DOM after context loss #3477 — force WebGL repaint on load and fall back to DOM after context loss

   Why I didn't write a reproduction test or open a PR: this manifests intermittently in real GPU rendering (texture atlas corruption that doesn't fire onContextLoss), so it can't be exercised under bun:test without real WebGL + xterm. The existing PRs address the deterministic triggers (reattach, resize, context loss) with mock-based tests, and a workaround already exists — launching with --disable-gpu (per #3794) forces DOM rendering and eliminates the issue at the cost of all GPU acceleration.

   To help maintainers if it happens again, the most useful info would be:

   • OS + Superset version
   • Whether you're using Chinese / CJK / emoji content
   • Whether it tends to follow tab switches, window resizes, display sleep/wake, or just extended idle
   • Whether selecting the garbled text repaints it correctly (this confirms the WebGL atlas theory)
   • Whether --disable-gpu makes it stop

   Recommend closing as a duplicate of #3794 once a maintainer confirms.
3. aerioeus commented on May 7, 2026

   

   aerioeus

   on May 7, 2026

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   OS + Superset version -> macos tahoe 26.4.1
   Whether you're using Chinese / CJK / emoji content - no just engish
   Whether it tends to follow tab switches, window resizes, display sleep/wake, or just extended idle -> no out of the blue
   Whether selecting the garbled text repaints it correctly (this confirms the WebGL atlas theory)
   Whether --disable-gpu makes it stop -> makes no sense with AI Agents
4. Kitenite commented on Jul 11, 2026

   

   Kitenite

   on Jul 11, 2026

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   Closing as a duplicate of #5605, the consolidated tracker for stale terminal-rendering issues from the July 2026 stale-issue sweep (no activity since 2026-06-01). If this still applies on a current build, comment on #5605 and we'll reopen.
5. Kitenite

   closed this as a duplicateof [Tracker] Terminal rendering corruption & visual glitches (stale-issue sweep, July 2026) #5605 on Jul 11, 2026