Fri, 04 Jun 2021 22:50:32 +0200 wenzelm tuned --- potentially more robust (e.g. session.phase_changed vs. isabelle_process.terminated);
Fri, 04 Jun 2021 22:46:11 +0200 wenzelm clarified signature;
Fri, 04 Jun 2021 22:30:17 +0200 wenzelm removed pointless option (see 3d0952893db8);
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