Revert "[bugfix] do not fuse end-of-page block into other blocks"
Revert "[bugfix] do not fuse end-of-page block into other blocks"

This reverts commit 5656590fa06023de76ef366451376156ee5bdec3.

picrin-scheme/picrin,omasanori/picrin,koba-e964/picrin,omasanori/picrin,dcurrie/picrin,ktakashi/picrin,leavesbnw/picrin,leavesbnw/picrin,koba-e964/picrin,ktakashi/picrin,dcurrie/picrin,picrin-scheme/picrin,koba-e964/picrin,ktakashi/picrin,leavesbnw/picrin