338537 - Disable "Move" and "Copy" in Message menu for .EML and message/rfc822

Status: NEW

(Thunderbird :: Mail Window Front End, defect)

Description

[Mike Cowperthwaite]

xref bug 259522.  This bug requests a simple way to avoid the issues there.
David said that bug is a front-end issue, but it's filed under the suite; this is for TB.

These two menu items still cause stability problems in TB for a message/rfc822 (forwarded message) in a standalone message window.  For a .EML, "Move" is already disabled, and "Copy" doesn't cause a problem -- but it doesn't do anything, either.

As Copy is a likely thing to try when the user wants to integrate the file or attachment into the mail folders, fixing this would make it clear that there's 
a problem.