[HttpKernel] Fix session initialized several times #38910
Merged
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The session injected in the request is a factory. When the request is cloned (ie sub-request) while the session is not yet used in the master request (the session is still a factory), both Master and Sub request will have a factory.
If both requests attempt to read the session afterward, they both triggers the factory, and both initialize the session.
It's not a dead end for the
SessionListener
because the session come from the container and is shared, but: