Remove extra vertical space at the beginning and end of embedded code blocks, in wiki formatted text.
Remove extra vertical space at the beginning and end of embedded code blocks, in wiki formatted text.

git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@3457 af82e41b-90c4-0310-8c96-b1721e28e2e2

jun66j5/trac-ja,walty8/trac,netjunki/trac-Pygit2,netjunki/trac-Pygit2,walty8/trac,walty8/trac,jun66j5/trac-ja,jun66j5/trac-ja,netjunki/trac-Pygit2,jun66j5/trac-ja,walty8/trac