Canonical didn't propose Window Indicators for GNOME. They proposed libappindicator, which was about notification icons only at the time.
And the reason why they're not going with MeeGo is that they suck as an upstream, if you want to package their UI bits. MeeGo is a distribution, they barely did releases in the past (as Moblin), the Moblin git repositories were (mostly) taken down (where's libsocialweb gone for example?), and the MeeGo repositories still aren't up. Finally they seem to hide their roadmaps and schedules from the community.
I thought that I could help get Moblin (at the time) on Fedora, updated a number of applications and libraries for newer versions of their dependencies, helped port NetworkManager-netbook, and nothing really came out of it.
All I can say is that Canonical is about as bad as MeeGo at working upstream.
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