Check whether size of generaldelta revlog is not bigger than its

regular equivalent. Test would fail if generaldelta was naive

implementation of parentdelta: third manifest revision would be fully

inserted due to big distance from its paren revision (zero).

  $ hg init repo

  $ cd repo

  $ echo foo > foo

  $ echo bar > bar

  $ hg commit -q -Am boo

  $ hg clone --pull . ../gdrepo -q --config format.generaldelta=yes

  $ for r in 1 2 3; do

  >   echo $r > foo

  >   hg commit -q -m $r

  >   hg up -q -r 0

  >   hg pull . -q -r $r -R ../gdrepo

  > done

  $ cd ..

  $ regsize=`du -s -b repo/.hg/store/00manifest.i | cut -f 1`

  $ gdsize=`du -s -b gdrepo/.hg/store/00manifest.i | cut -f 1`

  $ if [ $regsize -gt $gdsize ]; then

  >   echo 'generaldelta increased size of a revlog!'

  > fi