Wed, 08 Jul 2015 21:33:00 +0200 wenzelm clarified context;
Wed, 08 Jul 2015 19:28:43 +0200 wenzelm Variable.focus etc.: optional bindings provided by user;
Wed, 08 Jul 2015 15:37:32 +0200 wenzelm clarified text folds: proof ... qed counts as extra block;
Wed, 08 Jul 2015 14:30:00 +0200 wenzelm more accurate skip_proofs nesting, e.g. relevant for 'subgoal' command;
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