When I select text in st using the mouse, it sets both the primary selection and the clipboard selection. It should only set the primary selection. The clipboard is supposed to be only for explicitly requested copying.
From http://standards.freedesktop.org/clipboards-spec/clipboards-latest.txt: Application authors should follow the following guidelines to get correct behavior: - selecting but with no explicit copy should only set PRIMARY, never CLIPBOARD -- http://www.fastmail.com - IMAP accessible web-mail
