diff -r 32ad17fe2b9c -r befdd6833ec0 src/Pure/PIDE/markup_node.scala
--- a/src/Pure/PIDE/markup_node.scala	Thu Aug 19 16:08:59 2010 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,109 +0,0 @@
-/*  Title:      Pure/PIDE/markup_node.scala
-    Author:     Fabian Immler, TU Munich
-    Author:     Makarius
-
-Text markup nodes.
-*/
-
-package isabelle
-
-
-import javax.swing.tree.DefaultMutableTreeNode
-
-
-
-case class Markup_Node(val range: Text.Range, val info: Any)
-{
-  def fits_into(that: Markup_Node): Boolean =
-    that.range.start <= this.range.start && this.range.stop <= that.range.stop
-}
-
-
-case class Markup_Tree(val node: Markup_Node, val branches: List[Markup_Tree])
-{
-  private def add(branch: Markup_Tree) =   // FIXME avoid sort
-    copy(branches = (branch :: branches).sortWith((a, b) => a.node.range.start < b.node.range.start))
-
-  private def remove(bs: List[Markup_Tree]) =
-    copy(branches = branches.filterNot(bs.contains(_)))
-
-  def + (new_tree: Markup_Tree): Markup_Tree =
-  {
-    val new_node = new_tree.node
-    if (new_node fits_into node) {
-      var inserted = false
-      val new_branches =
-        branches.map(branch =>
-          if ((new_node fits_into branch.node) && !inserted) {
-            inserted = true
-            branch + new_tree
-          }
-          else branch)
-      if (!inserted) {
-        // new_tree did not fit into children of this
-        // -> insert between this and its branches
-        val fitting = branches filter(_.node fits_into new_node)
-        (this remove fitting) add ((new_tree /: fitting)(_ + _))
-      }
-      else copy(branches = new_branches)
-    }
-    else {
-      System.err.println("Ignored nonfitting markup: " + new_node)
-      this
-    }
-  }
-
-  def flatten: List[Markup_Node] =
-  {
-    var next_x = node.range.start
-    if (branches.isEmpty) List(this.node)
-    else {
-      val filled_gaps =
-        for {
-          child <- branches
-          markups =
-            if (next_x < child.node.range.start)
-              new Markup_Node(Text.Range(next_x, child.node.range.start), node.info) :: child.flatten
-            else child.flatten
-          update = (next_x = child.node.range.stop)
-          markup <- markups
-        } yield markup
-      if (next_x < node.range.stop)
-        filled_gaps ::: List(new Markup_Node(Text.Range(next_x, node.range.stop), node.info))
-      else filled_gaps
-    }
-  }
-}
-
-
-case class Markup_Text(val markup: List[Markup_Tree], val content: String)
-{
-  private val root = new Markup_Tree(new Markup_Node(Text.Range(0, content.length), None), markup)  // FIXME !?
-
-  def + (new_tree: Markup_Tree): Markup_Text =
-    new Markup_Text((root + new_tree).branches, content)
-
-  def filter(pred: Markup_Node => Boolean): Markup_Text =
-  {
-    def filt(tree: Markup_Tree): List[Markup_Tree] =
-    {
-      val branches = tree.branches.flatMap(filt(_))
-      if (pred(tree.node)) List(tree.copy(branches = branches))
-      else branches
-    }
-    new Markup_Text(markup.flatMap(filt(_)), content)
-  }
-
-  def flatten: List[Markup_Node] = markup.flatten(_.flatten)
-
-  def swing_tree(swing_node: Markup_Node => DefaultMutableTreeNode): DefaultMutableTreeNode =
-  {
-    def swing(tree: Markup_Tree): DefaultMutableTreeNode =
-    {
-      val node = swing_node(tree.node)
-      tree.branches foreach ((branch: Markup_Tree) => node.add(swing(branch)))
-      node
-    }
-    swing(root)
-  }
-}