fix: resolve GSOD issues with multiple VSCode windows (#8949)

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Summary

This PR fixes the Grey Screen of Death (GSOD) issues that occur when running multiple Roo instances in different VSCode windows, particularly when terminal commands are executed by sub-tasks.

Problem

Users were experiencing:

• Complete VSCode window freezes (GSOD) when running Roo Orchestrator workflows in multiple windows
• Diff editor timeout errors across all windows
• VSCode window crashes with exit code 5 after ~2 minutes
• Terminal command execution blocking the UI thread

Solution

1. Non-blocking Terminal Operations

• Made shell execution event handlers asynchronous using setImmediate
• Prevents UI thread blocking during terminal operations
• Added proper error handling for shell execution events

2. Enhanced Diff Editor Resilience

• Increased timeout from 10s to 15s for slower systems
• Added retry mechanism (up to 2 attempts) on timeout
• Non-blocking diff editor operations

3. Task Isolation

• Improved terminal isolation to prevent cross-task interference
• Terminals are now properly isolated per task
• Enhanced cleanup when tasks complete

4. Comprehensive Testing

• Added 409 lines of tests for concurrent terminal operations
• Tests verify non-blocking behavior, task isolation, and error handling
• All existing tests pass without regression

Testing

• ✅ All new tests pass
• ✅ All existing terminal and editor tests pass
• ✅ No regressions detected
• ✅ Code review confidence: 92%

Related Issue

Fixes #8949

Impact

This fix will significantly improve stability for users who:

• Work with multiple VSCode windows simultaneously
• Use Roo Orchestrator workflows across different worktrees
• Experience frequent GSOD issues during terminal operations

Feedback and testing welcome!

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Important

Fixes GSOD issues by making terminal operations non-blocking, improving diff editor resilience, and ensuring task isolation in VSCode.

• Behavior:
  • Made terminal shell execution event handlers asynchronous using setImmediate in TerminalRegistry.ts to prevent UI blocking.
  • Increased diff editor timeout from 10s to 15s in DiffViewProvider.ts and added retry mechanism for timeouts.
  • Improved terminal isolation to prevent cross-task interference in TerminalRegistry.ts.
• Testing:
  • Added 409 lines of tests in TerminalRegistry.concurrent.spec.ts to verify non-blocking behavior, task isolation, and error handling.
  • Tests cover concurrent terminal operations, task isolation, and error handling.
• Misc:
  • Enhanced error handling for shell execution events in TerminalRegistry.ts.
  • Minor logging changes in TerminalRegistry.ts.

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Code Review Complete

No issues found during review. The implementation looks solid:

✅ Non-blocking terminal operations - Properly uses setImmediate to defer event handler execution
✅ Enhanced diff editor resilience - Timeout increased to 15s with retry mechanism
✅ Task isolation - Correctly prevents cross-task terminal interference
✅ Error handling - Comprehensive try-catch blocks in async handlers
✅ Test coverage - 409 lines of tests validating concurrent operations and edge cases

The changes effectively address the GSOD issues described in #8949.

Follow Along on Roo Code Cloud

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