[Bug 583577] Re: "View by Threads with Unread" results in no ability to read some messages

[Bryn Hughes]

Steps to reproduce:

1. Start Thunderbird
2. Set view to "Threads with Unread"
3. Attempt to read through messages (bug most easily triggered with busy mailing lists, for instance the zfs-discuss list)
4. Some message threads cannot be expanded, appears to be related to threads with duplicate messages

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Title:
  "View by Threads with Unread" results in no ability to read some
  messages

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