[tridev-tej]

Plugins unregistered or blocked during historic replay could leave hooks active.

Stop the cancelled registration before installing more hooks, while preserving replay order and nested replacements.

[Muguett-DBY]

I checked d63d7491 on Windows with CPython 3.12.14.

• uv run pytest: 260 passed, with pytest plugin autoload disabled.
• I compared the base and this head across eight cases: unregistering or blocking during a historic implementation or its result callback, with and without a replacement registered under the same name. The base leaves the old historic and ordinary hook implementations active; this head removes them while retaining the unrelated plugin and, where applicable, the replacement.

No issue found in that scope. I haven't independently tested other Python versions or platforms. Codex helped with the source review and checks.

[tridev-tej]

@Pierre-Sassoulas any further feedback on this, or is it good to merge?