5. The method of claim 1 , wherein the ordered tree structure comprises a binary tree, and wherein generating the ordered tree structure for the graphical content portions comprises: comparing graphical locations of the graphical content portions from the sort order with graphical locations of the graphical content portions in the first layout; recursively inserting the graphical content portions into the binary tree as nodes; and responsive to evaluating a current graphical content portion to insert into the binary tree, the current graphical content portion graphically spanning a first previously inserted graphical content portion in a current branch of the binary tree and graphically spanning a second previously inserted graphical content portion in a right branch of the binary tree, preventing an association of additional nodes to the current branch of the binary tree.
5. The method of claim 1 , wherein the ordered tree structure comprises a binary tree, and wherein generating the ordered tree structure for the graphical content portions comprises: comparing graphical locations of the graphical content portions from the sort order with graphical locations of the graphical content portions in the first layout; recursively inserting the graphical content portions into the binary tree as nodes; and responsive to evaluating a current graphical content portion to insert into the binary tree, the current graphical content portion graphically spanning a first previously inserted graphical content portion in a current branch of the binary tree and graphically spanning a second previously inserted graphical content portion in a right branch of the binary tree, preventing an association of additional nodes to the current branch of the binary tree. 6. The method of claim 5 , further comprising generating a presentation order for the graphical content portions by iterating over the sort order, and executing an in-order traversal of the ordered tree structure.