Commit ea6a7c09 added a workaround for
bug 304986 (high CPU usage because KFileItemModelRolesUpdater requests
previews for the same files over and over again after, e.g., a rename
operation). The KDE/4.10 branch of kdelibs contains the real fix for
this issue (b8f64ca3f4b6311519c21046031d66d9d0a570c6), so the workaround
can be removed.