avoid a misconfiguration infinite loop

[ergohack]

Description (*)

The virtual type configurations, in di.xml files, are not supposed to be self‑referential, … but if they ever are this function will spin in an infinite loop.

Changes

Added a test to avoid a self‑referential mapping, returning the self‑reference instead of endlessly spinning.

Fixed Issues (if relevant)

unknown

Manual testing scenarios (*)

Configure a di.xml <virtualType …> node to be self‑referential (i.e. not actually virtual). This will cause the app to spin, infinitely, on the dereferencing attempt. Note that the self‑reference can be from a chain of <virtualType …> nodes and not just a single node.

Contribution checklist (*)

• [√] Pull request has a meaningful description of its purpose
• [√] All commits are accompanied by meaningful commit messages
• [n/a] All new or changed code is covered with unit/integration tests (if applicable)
• [n/a] README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• [unknown] All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] avoid a misconfiguration infinite loop #38822: avoid a misconfiguration infinite loop

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