If you start installing a package from an application's detail page, (e.g. Darktable) and while it is installing, go to the details page for another application. (e.g. tremulous) and just sit there while darktable installs, when the package is installed, the notification that pops up tells me tremlous is installed and when i click launch on the notification, tremulous is opened.
THis one is now fixed in upstream master.
Looking in upstream git this commit exists on the gnome-310 branch, so I believe we can safely say it's fixed in F20 by now: so, closing. https://git.gnome.org/browse/gnome-software/commit/?h=gnome-3-10&id=0bca23e1d0e489ef29a23d390c28cf3c23c6b31a