When composing a full-quote reply, the signature is prepended to the top (signaturePosition = 'top'). The full-quote template always ends with <div><br></div>, so htmlLastLineEmpty returns false — causing body.append('<br><br>') to fire unconditionally and append two extra <br> elements after the blockquote instead of before a bottom-placed signature.

Changes

• email_reply.coffee — Move body.append('<br><br>') inside the else (bottom-placement) branch. It now only runs when the signature is appended to the bottom; top-placement already uses body.prepend('<br><br>') for spacing and needs nothing added at the tail.

  -      if !App.Utils.htmlLastLineEmpty(body)
  -        body.append('<br><br>')
         ...
         else if signaturePosition is 'top'
           body.prepend(signature)
           body.prepend('<br><br>')
         else
  +        if !App.Utils.htmlLastLineEmpty(body)
  +          body.append('<br><br>')
           body.append(signature)

• html_utils.js — Add a htmlLastLineEmpty QUnit test case for a full-quote body structure (outer body element whose last child is <div><br></div>) to document the precondition that drives the bug. Also adds signatureRemoveByHtml cases covering signatures nested inside <blockquote> elements (the full-quote reply scenario from issue Replying to your own articles (agent perspective) does not generate signature on reply #2319).

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