Improve unread message visibility inside collapsed conversation threads

[Ortez]

When using conversation view, Thunderbird collapses message threads by default. If an unread message is inside a collapsed thread, the thread header remains grey/unbold, even though the folder shows unread messages. This makes unread messages difficult to locate, especially across multiple accounts.

Please consider one of these improvements:

Automatically expand any conversation thread that contains unread messages

OR make the entire collapsed thread bold when it contains unread messages

Either behaviour would make unread messages immediately visible and prevent users from having to manually expand multiple threads to find them.

Thank you for considering this usability improvement.

[Jon]

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