[RCU] Line Spacing Issue in the HTML Text Editor

I am using Roundcube SVN Version 2999 (latest), but ever since I started using Roundcube (a while ago) I have noticed that when I am composing or replying to an email the editor seems to add extra spacing lines (almost like double-spacing) and it is difficult to tell how the recipient will see the message -- i.e. with lots of extra space or not. Is there a way to correct this in the HTML editor and make the editor use single spacing instead of double spacing? I found that lists, such as bullet lists, are single spaced but regular text seems not to be.

I am typically using Firefox 3.5.3, but tested this on IE 8 and Google Chrome as well and saw the same results.

Thanks for any help! Keith

List info: http://lists.roundcube.net/users/