#1608342 is about surfacing apps that can run natively on Mir under Unity 8. This bug is about surfacing X11 applications under Unity 8. They're separate problems with different solutions. In the case of native applications, an entry in the .desktop file should indicate Mir compatibility. No such entry should invoke the containerless Libertine launcher and an appropriate Mir client such as XMir or a Mir terminal emulator.
#1608342 is about surfacing apps that can run natively on Mir under Unity 8. This bug is about surfacing X11 applications under Unity 8. They're separate problems with different solutions. In the case of native applications, an entry in the .desktop file should indicate Mir compatibility. No such entry should invoke the containerless Libertine launcher and an appropriate Mir client such as XMir or a Mir terminal emulator.