Comment 9 for bug 441942

Note the comments in two other bugs now marked as duplicates of this one. In particular, bug 545113.

In particular I can confirm that I see no notification or indicator change if mail comes in while I'm sending a new mail with a full-screen window. That seems problematic since I'd particularly like to know about incoming mail when I'm responding to an active thread. But I think that should be a separate bug, and it would be nice to be able to file that bug after seeing what the documentation says should be happening.