UR overrides mail with same subject

[UltraUser]

Hello,

I've just bumped into a new problem.

When I want to keep my mails in UR, I save them as .eml files from Thunderbird. Then, I turn to UR to import them. Works like a charm (would definitely prefer to have a direct import, drag/drop, Launchy look-a-like, but well...)

I've just imported a mail that is an answer to an empty subject. As a result, it's name is "Re:". Problem is: another email was there somewhere in my UR database with that same name. And the result was near-catastrophic: the contents of the original email was replaced with the new one! And the new one was transformed as a linked email!

Wow. I was fortunate to notice this straight away. Because UR didn't tell me a thing.

I had to undo my operations, change the name of the original email in UR and then import the new one...

UR people: is this "copy with same name will erase existing mails" a defect or a feature? I didn't test this strange behaviour with other documents. Should I expect the same problem? Did I do something wrong? Will you fix it?

Thanks for your help,
David