[Bug 940631]

[Kai Engert]

(In reply to Matt from comment #61)
> I was reading in Bug 1361838#c2 that  .uiBusy == true might be suitable for mitigating the issue

As I understand it, that's simply a flag that can be queried, whether
the MP dialog is currently shown.

Detecting this state is only part of the problem. You still need to
change all places that obtain logins to query for that state, and try
again at a later time, if busy.

Instead of "query is MP prompt currently shown", the potential approach
to change "give me the login" to return a "would block" state might be
better, as it can prevent a race. (E.g. code queries if MP is shown,
gets reply "no", decides to query for login, but in the meantime another
thread has triggered the MP. This could still result in two MP prompts
being shown.)

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https://bugs.launchpad.net/bugs/940631

Title:
  Thunderbird asks three times for my master password

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