[BUG] Linux/KDE/Wayland: Starting claude from VS Code integrated terminal spawns 2 extra VS Code windows

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported for Linux/Wayland yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

Discovery

This issue was identified and analyzed by Claude Sonnet 4.6 (claude-sonnet-4-6) running as Claude Code itself, during a debugging session in the affected environment.

Related Issues

This is the Linux/Wayland equivalent of the Windows bug fixed in v2.1.70:

• #30975 — Windows: 3 empty VS Code windows on startup from integrated terminal
• #31080 — duplicate
• #31280 — duplicate
• #32705 — duplicate (with root cause analysis)

The Windows fix addressed the issue for non-Linux platforms. The Linux/Wayland case was never addressed.

What's Wrong?

Starting claude from VS Code's integrated terminal on KDE/Wayland causes 2 extra VS Code windows to open on every startup.

Root Cause (based on v2.1.88 decompiled source — please verify against v2.1.150)

getInstallationEnv() in src/utils/ide.ts clears DISPLAY='' on Linux to prevent the GUI from launching, but does not clear WAYLAND_DISPLAY. On a Wayland session, Electron ignores DISPLAY and uses WAYLAND_DISPLAY to open a window.

// src/utils/ide.ts
function getInstallationEnv() {
  if (getPlatform() === 'linux') {
    return {
      ...process.env,
      DISPLAY: '',        // ← clears X11 only
      // WAYLAND_DISPLAY not cleared — Electron still opens on Wayland
    }
  }
  return undefined
}

Each of the following calls spawns a new VS Code window via Wayland:

1. code --list-extensions
2. code --list-extensions --show-versions
3. code --force --install-extension anthropic.claude-code (triggered every startup because installed extension version < CLI version)

Proposed Fix

Either clear WAYLAND_DISPLAY alongside DISPLAY, or apply the same ELECTRON_RUN_AS_NODE=1 fix used for Windows to Linux as well:

function getInstallationEnv() {
  if (getPlatform() === 'linux') {
    return {
      ...process.env,
      DISPLAY: '',
      WAYLAND_DISPLAY: '',        // add this
      ELECTRON_RUN_AS_NODE: '1',  // or this (same fix as Windows)
    }
  }
  return { ...process.env, ELECTRON_RUN_AS_NODE: '1' }
}

Steps to Reproduce

1. KDE Plasma on Wayland (Fedora or similar)
2. Open VS Code
3. Open VS Code's integrated terminal
4. Run claude in any project directory
5. Observe: 2 extra VS Code windows appear

Environment

• OS: Fedora / KDE Plasma / Wayland (WAYLAND_DISPLAY=wayland-0, DISPLAY=:0)
• Claude Code CLI: 2.1.150
• VS Code extension: 2.1.145
• Terminal detection: TERM_PROGRAM=vscode → isSupportedTerminal() returns true → auto-install triggers

Evidence

VS Code log directory shows rapid consecutive empty sessions on every claude startup:

~/.config/Code/logs/20260524T132012/  (empty)
~/.config/Code/logs/20260524T132013/  (empty)
~/.config/Code/logs/20260524T132015/  (empty)

Pattern repeated multiple times, each cluster corresponding to a claude startup.