Tue, 16 Nov 2021 21:47:38 +0100 wenzelm tuned;
Tue, 16 Nov 2021 21:43:41 +0100 wenzelm removed redundant test (see also 86fac52c2795, a9fea3f11cc0);
Tue, 16 Nov 2021 21:21:15 +0100 wenzelm just one Presentation.State for all sessions: avoid duplication of already presented theories (very slow) and cached theory export (not very slow);
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