[HttpKernel] Fix setting the session on the main request when it's started by a subrequest #49265
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…arted by a subrequest
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When a sub-request starts the session (eg when app.flashes is used in a template), the main request remains unaware of it and so does
SessionListeneras a consequence. This prevents it from running itsonKernelResponselogic, leading to e.g. aSet-Cookiebeing sent on such pages even when a session is already active.