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Conditionally render an ''Attach File'' button.

Arguments:
 - alist: the data for the list of attachments
 - add_button_title=None: the title of the "Attach" button
-->
<form xmlns="http://www.w3.org/1999/xhtml"
      xmlns:py="http://genshi.edgewall.org/"
      xmlns:xi="http://www.w3.org/2001/XInclude"
      xmlns:i18n="http://genshi.edgewall.org/i18n"
      py:if="alist.can_create" method="get" action="${alist.attach_href}" id="attachfile">
  <div>
    <input type="hidden" name="action" value="new" />
    <input type="submit" id="attachfilebutton"
           value="${value_of('add_button_title') or
                    (_('Attach another file') if alist.attachments else _('Attach file'))}"/>
  </div>
</form>
