Comment 28 for bug 338695

"there are plenty of bugs like this that have multiple, separate projects on them"

Yes, single bug reports have been used in the past for things like library/language transitions on many different packages. However, that tends to waste more time (in extra bug mail to uninterested people) than it saves (in sharing code and ideas). So it's not clear-cut, but in general, two projects/packages should share a bug report only if it's likely that the same diff will fix the bug in both places (e.g. Mozilla Firefox vs. Ubuntu firefox), or if there's only one bug but the respective people need to collaborate in working out which software needs fixing (this often happens with Notify OSD vs. gnome-settings-daemon) .