Lack of new line when caret at top and signature at bottom

First, thanks for all your hard work creating and maintaining such a fantastic email client.

One thing that's been bothering me is the lack of new line if I set the caret for top posting and signature placement to the bottom. This particular setup leaves the caret immediately before the attribution line and means I have to hit the enter key twice every time I reply to an email before I can start typing. (Unless I'm missing a setting somewhere?)

I'm aware of the advantages of top posting vs. bottom posting and often interleave replies, but many people I interact with expect this arrangement (top post with signature at bottom) — probably because it's the default in many other email clients and services (e.g. Gmail).

Steps to reproduce:

1. Add a signature
   
2. Set default signature placement to "Bottom"
   
3. Set caret placement to "Always at Top"
   
4. Click "Reset Usage History" if needed
   
5. Reply to an email

Expected results:

Caret (represented by a | below) is at top of message, there is a blank line, and then the "On 31 Jul 2015, ..." attribution line starts.

|

On 31 Jul 2015, at 21:00, John Smith wrote:

> Lorem ipsum dolor sit amet, consectetur adipisicing 
> elit, sed do eiusmod tempor incididunt ut labore et

--
signature here

This is also how the caret position works in MailMate if caret placement is set to "Always at Top" and signature position is set to "Top" (even if there's no signature).

Actual results:

Cursor is immediately before "On 31 Jul 2015, ..." with no line breaks. I have to hit the enter key twice before I can start typing.

|On 31 Jul 2015, at 21:00, John Smith wrote:

> Lorem ipsum dolor sit amet, consectetur adipisicing 
> elit, sed do eiusmod tempor incididunt ut labore et

-- 
signature here

If I don't hit the enter key twice I get:

Hi John, email body hereOn 31 Jul 2015, at 21:00, John Smith wrote: