avl-tree--del-balanceavl-tree--del-balance is a compiled Lisp function in `
avl-tree.el'. (avl-tree--del-balance NODE BRANCH DIR) Rebalance a tree after deleting a node. The deletion was done from the left (DIR=0) or right (DIR=1) sub-tree of the left (BRANCH=0) or right (BRANCH=1) child of NODE. Return t if the height of the tree has shrunk.