Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gtk+2.0 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/9
This needs to be supported by whatever is rendering the menu and
handling events (in this case, Unity). However, I'm not even sure that
gtk supports this feature. I think it was a Gecko only feature, so
you're probably pretty much out of luck to have that supported again
** Project changed: global