pressing enter/return on the first message in thread triggers two actions -- toggling whether the thread is expanded and opening the message in a new window. The latter (opening message) is the default action when any message is highlighted and is probably the appropriate action to take. Toggling the expansion of the thread is normally done by using the left and right arrow keys (or at least that's how I do it). It seems odd for the thread to be expanded/collapsed when the message is opened (two unrelated actions).
Searching the bug DB, and noticed this looks like a duplicate of 99193.
*** This bug has been marked as a duplicate of 99193 ***
Status: UNCONFIRMED → RESOLVED
Last Resolved: 16 years ago
Resolution: --- → DUPLICATE
marking verified as a duplicate
Status: RESOLVED → VERIFIED
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