Close the bottom message pane in messenger and double-click on a newsgroup header, for example.. Nothing happens unless it is the parent of a thread in which case it expands.. The behavior in 4.x was to open the message in a new window if double-clicked. Thread expansion was handled by the thread "widget" itself not the entire message header.
*** This bug has been marked as a duplicate of 10875 ***
Status: UNCONFIRMED → RESOLVED
Last Resolved: 18 years ago
Resolution: --- → DUPLICATE
The thread widget is also covered in bug 21094
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