[Evolution] Double signatures when saving and reopening mail

[Max <max depf net>]

Dear Evolution-Devs,

I have the following issue:

I have configured a signature in evolution. When I start writing a mail, 
get interrupted by something, save it as a draft and reopen it later, 
the signature will be appended twice.

Steps to reproduce:

0. Configure Signature (Preferences > Composer Preferences > Signatures)
1. Create new mail with signature
2. Save as draft
3. Close mail
4. Reopen mail
5. Find 2 signatures

I am currently running:

Evolution 3.10.3

On up to date Arch Linux x64

Linux 3.12.9-2-ARCH #1 SMP PREEMPT Fri Jan 31 10:22:54 CET 2014 x86_64 
GNU/Linux

Kind regards

Max