Problem: Signatur / IE 8 / spell check

[Spreech]

Hello,

maybe anybody can confirm the following problem:

I created a signature in Roundcube which should be used when creating a new message.
When I create a new message the signature is added automatically - that' s ok.

But after clicking "spell check" the signature format gets broken - the complete signature is in one line.

Problem occurs only with IE8. With IE7 and FF everything is fine.

I am not sure if there is still a bug about this problem (i can' t find anything related) or if this is a real problem.
That' s why I decided to ask here before creating a bug report

Thanks.

Spreech