Cancel and await idle_start future if the task was canceled after an IMAP connection was lost

[jbouwh]

Proposed change

If an IMAP server is awaited for push messages and the connection is lost, the IDLE command fails.
The future that was awaited still needs to be canceled.

This fix may solve issue #122809

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: IMAP - Task was destroyed but it is pending!  #122809
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

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To help with the load of incoming pull requests:

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[Copilot]

Pull request overview

This PR addresses a cleanup issue in the IMAP push (IDLE) loop where the idle_start() future could remain pending after a lost connection, leading to “Task was destroyed but it is pending!” warnings.

Changes:

• Track the idle_start() future in the IMAP push loop and attempt to cancel/await it in a finally block to prevent leaked pending futures.
• Add/adjust a regression test to assert the IDLE future is canceled after a simulated connection loss.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
homeassistant/components/imap/coordinator.py	Adds finally cleanup to cancel/await the pending IDLE future after errors.
tests/components/imap/test_init.py	Extends the lost-connection push test to validate the IDLE cancellation path via logs.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

homeassistant/components/imap/coordinator.py:7

• Remove the unused suppress import (or use it) to avoid failing lint checks for an unused import.

from datetime import datetime, timedelta

[jbouwh]

I still need some help to fix the code coverage for the new code. Optionally this is fixed later to allow the patch to be released.

[jbouwh]

Discussed with @bdraco , desided to merge