Text selection is wrong: missing lines #2344

Consider this document: http://lists.dragonflybsd.org/pipermail/users/attachments/20121010/7996ff88/attachment-0002.pdf
Go to page #4.
Select text from the word "Hardware" to the word "Goal".
Large portions of text, ex. "- 2x Xeon X5650", don't get selected at all.

There are few other bugs about selection, like these:
#2097
#1994
#951

But I didn't get immediate feeling these are the same issues.