when calculating desired queue size, block size should not depend on whether or not they are merged in the requests
when calculating desired queue size, block size should not depend on whether or not they are merged in the requests

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@2926 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent