Thu, 04 Apr 2013 18:44:22 +0200 wenzelm more conventional synchronized access to Options_Variable -- avoid Swing_Thread getting in the way, which might be absent in some environments (e.g. SWT);
Thu, 04 Apr 2013 18:25:47 +0200 wenzelm added missing file;
Thu, 04 Apr 2013 18:20:00 +0200 wenzelm tuned signature -- avoid intrusion of slightly odd Swing structures into pure Markup_Tree;
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