[BUG] Terminating an active subtask fails to resume the parent task

[Dinesh-Gautam]

Problem (one or two sentences)

When a user terminates an active subtask (e.g., via the "Terminate" button) before the attempt_completion tool, it fails to automatically return and resume the parent task.

Context (who is affected and when)

This bug occurs in orchestrator mode when a parent task delegates work to a child task (subtask). If the subtask is manually canceled by the user (e.g., by interrupting the API request and then clicking the "Terminate" button), the system should resume the parent task.

Reproduction steps

1. Start a new task in orchestrator mode.
2. Provide an instruction that prompts the creation of a subtask.
3. Approve the subtask creation.
4. Once the subtask begins its first API request and is actively streaming, immediately Click the "Cancel Request" button. then, Click the "Terminate" button.

Expected result

should return to the parent task

Actual result

The parent task is not resumed.

Variations tried (optional)

No response

App Version

3.35.4

API Provider (optional)

None

Model Used (optional)

No response

Roo Code Task Links (optional)

No response

Relevant logs or errors (optional)

[Dinesh-Gautam]

claiming

[roomote]

I've analyzed this issue and here's my proposed implementation plan:

Problem Analysis

When a user terminates an active subtask (via Cancel Request + Terminate button) before it reaches attempt_completion, the system fails to automatically resume the parent task. This leaves the user stuck without the parent task being reactivated.

Root Cause

The issue occurs in the clearTask flow. When a subtask is terminated:

1. The clearTask message handler in webviewMessageHandler.ts calls provider.clearTask()
2. clearTask() simply removes the current task from the stack via removeClineFromStack()
3. There's no logic to check if the terminated task has a parent that should be resumed

Proposed Solution

Modify the clearTask() method in ClineProvider.ts to:

1. Check if the current task being cleared has a parentTaskId
2. If it does, treat it as a delegated subtask that needs to return control to its parent
3. Call reopenParentFromDelegation() with an appropriate completion message indicating the subtask was terminated
4. This will properly restore the parent task and allow it to continue

Implementation Details

The fix will be in src/core/webview/ClineProvider.ts:

• Modify the clearTask() method to detect parent-child relationships
• When clearing a subtask, inject a termination result into the parent's history
• Reopen the parent task to resume execution

This approach ensures consistency with the existing delegation flow and properly maintains the task hierarchy.

Please mention @roomote in a comment saying that you approve this plan, and I'll proceed with the implementation.