FS#1652, #FS1699

Ignore-this: b30b4a3061ad7a485012f6fd55cdfc78
This patch fixes problems with blank lines which contain whitespace before EOL.
It also fixes an issue with preformatted syntax mode not triggering following
p_open instructions under some circumstances.

Note: The fix can result in swallowing of non-eol white space that precedes the
EOL.  This can happen when there is no non-whitespace CDATA between the end of
the previous syntax mode and the EOL character.

darcs-hash:20091004190359-f07c6-36bb418cb9be8bbaff741b4cbe135c442d0bde81.gz