Comment 6 for bug 557972

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update of patch for 2.1.1
if the subject is all ascii, then cat the prefix and subject
before it is instantiated. Hope to solve prefix only subject
1st line.

Note: with this patch without $d, Re: [prefix] is now
mungled to [prefix] Re:. This is useful if someone post new
issue as follow up to old subject like;
New subject bah bah was Re: [prefix] foo