Add new helper for matching reauth/reconfigure config flows

[epenet]

Breaking change

Proposed change

As we seek to prevent reauth/reconfigure flows from creating new entries, whilst at the same time preventing reauth/reconfigurations from updating other entries, I think it makes sense to add this helper.

• TODO: add tests (90b6766)
• TODO: add documentation Document _abort_if_unique_id_mismatch helper developers.home-assistant#2353

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Additional information

• This PR fixes or closes issue: fixes #
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• Link to documentation pull request: Document _abort_if_unique_id_mismatch helper developers.home-assistant#2353

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[home-assistant]

Hey there @frenck, @joostlek, mind taking a look at this pull request as it has been labeled with an integration (spotify) you are listed as a code owner for? Thanks!

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[frenck]

I'm not sure if we should assume the unique ID is being used for detecting these cases.

[frenck]

I think it makes sense to add this helper.

Can you elaborate on that? There is nothing in the PR description that explain the foundation behind it.

[epenet]

I think it makes sense to add this helper.

Can you elaborate on that? There is nothing in the PR description that explain the foundation behind it.

It's a pattern I've bumped into a few times. Axis and abode for example use this pattern.
It was used by integrations when reconfigure wasn't available.
I'll look for more examples on Monday

[epenet]

I think it makes sense to add this helper.

Can you elaborate on that? There is nothing in the PR description that explain the foundation behind it.

It's a pattern I've bumped into a few times. Axis and abode for example use this pattern. It was used by integrations when reconfigure wasn't available. I'll look for more examples on Monday

It's also partially linked to #127527