Don't keep the whole list of Node objects around, extract the relevant information in cheap objects instead.
Don't keep the whole list of Node objects around, extract the relevant information in cheap objects instead.

Related to #5782.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@6634 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac