The tree is built in. There's a really good explanation (with "pictures") of the tree behavior detailed here: http://vimdoc.sourceforge.net/htmldoc/usr_32.html

The tree is built in. There's a really good explanation (with "pictures") of the tree behavior detailed here: http://vimdoc.sourceforge.net/htmldoc/usr_32.html http://vimdoc.sourceforge.net/htmldoc/usr_32.html