Users should be allowed to specify that a comment entered into the additional comments textarea should be attached to the bug report as an attachment rather than a comment. Not only does this provide a much easier way to submit an attachment via cut and paste when complex updates like obsoleting older attachments and requesting review are not required, it also makes it possible to divert large comments into attachments, for example by automatically checking the box enabling this functionality when a comment reaches a certain size. When autodiversion of large comments to attachments is enabled, it should be very obvious when it is going to take place. For example, we could display a warning message next to the Additional Comments textarea and color the textarea's background light red or some other color. When autodiversion is enabled, it should also be possible for the user to cancel it if she decides that the text really should be a comment. In order to do this, attachment creation must be refactored into Attachment.pm, which is bug 302726. Bug 232218 could probably also be dealt with similarly.
sounds very similar to bug 130011
please make sure that people get *sent* copies of the attachment in bugmail.