src/Pure/PIDE/markup_tree.scala
Thu, 04 Apr 2013 18:20:00 +0200 wenzelm tuned signature -- avoid intrusion of slightly odd Swing structures into pure Markup_Tree;
Sun, 30 Dec 2012 20:15:02 +0100 wenzelm ignore markup elements over empty body, which are not well-defined within markup tree and fail to work with merge_disjoint (e.g. multiple inlined positions);
Sat, 15 Dec 2012 18:30:09 +0100 wenzelm maintain subtree_elements for improved performance of cumulate operator;
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