Dasha: Notify-OSD is a transparent message that only notifies for a few seconds. The indicator applet needs to have the message in order to be consistent with what it was designed for.
And yes, closing thunderbird should minimize it to the indicator. I hate that behavior, but in order to be consistent with the current methods, it needs to be done. But I'm sure this is known.
Dasha: Notify-OSD is a transparent message that only notifies for a few seconds. The indicator applet needs to have the message in order to be consistent with what it was designed for.
And yes, closing thunderbird should minimize it to the indicator. I hate that behavior, but in order to be consistent with the current methods, it needs to be done. But I'm sure this is known.