[Bug 1012158] Re: Unity launcher icon now only launches TB, additional icon(s) open to control

[Doug McMahon]

If I'm understanding the change correctly ,(and it seems to work well both when launching from launcher or messaging)  it should be 
StartupWMClass=Thunderbird-bin

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https://bugs.launchpad.net/bugs/1012158

Title:
  Unity launcher icon now only launches TB, additional  icon(s) open  to
  control

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