Wed, 28 Aug 2013 17:20:16 +0200 wenzelm tuned proofs;
Wed, 28 Aug 2013 16:36:46 +0200 wenzelm uniform use of isabelle.jEdit.Popup, based on generic screen location operations;
Wed, 28 Aug 2013 15:14:58 +0200 wenzelm more elementary Popup via JLayeredPane -- avoid javax.swing.PopupFactory with its many problems and dangers of accidental HeavyWeightPopup (especially on Mac OS X);
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