Email Diff broker skips diff when binary files are added

=== Summary ===

When I add a binary file and slightly change a text file, the "Email Diff" broker says the diff is too large.

I would rather it include the diff for the text files and simply indicate Added/Modified/Deleted for binary files, like the command-line "hg diff" and the BitBucket website.

=== Background ===

I have a nightly script that updates a website mirror, commits the changes and pushes them to BitBucket.

Whenever the change is a new PDF file (like a weekly church bulletin), the email looks like this:

{{{
https://bitbucket.org/edbrannin/holyname-greece.org-mirror/changeset/ff056ba1ca19/\\
changeset: ff056ba1ca19
user: update.sh
date: 2012-09-04 12:29:41
summary: Mirror update
affected #: 2 files
Diff too large to display.
}}}

The linked-to changeset's patch (to which I will gladly grant access for anyone investigating this) is only 1193 bytes on the command-line:

{{

{\\ $ hg log -pvr ff056ba1ca19\\ changeset: 47:ff056ba1ca19\\ user: update.sh\\ date: Tue Sep 04 06:29:41 2012 -0400\\ files: holyname-greece.org/Bulletins/HNJ 09-09-12.pdf holyname-greece.org/PDF files.htm\\ description:\\ Mirror update diff -r a9a212ee468d -r ff056ba1ca19 holyname-greece.org/Bulletins/HNJ 09-09-12.pdf\\ Binary file holyname-greece.org/Bulletins/HNJ 09-09-12.pdf has changed\\ diff -r a9a212ee468d -r ff056ba1ca19 holyname-greece.org/PDF files.htm\\ --- a/holyname-greece.org/PDF files.htm Sun Sep 02 06:53:07 2012 -0400\\ +++ b/holyname-greece.org/PDF files.htm Tue Sep 04 06:29:41 2012 -0400\\ @@ -63,7 +63,7 @@ <div id="apDiv1"> <p align="center"><span class="style1">Weekly Bulletins:</span></p>* <!--p align="center" class="style2"><a href="Bulletins/HNJ 09-09-12.pdf">09-09-12</a></p--> * <p align="center" class="style2"><a href="Bulletins/HNJ 09-09-12.pdf">09-09-12</a></p> <p align="center" class="style2"><a href="Bulletins/HNJ 09-02-12.pdf">09-02-12</a></p> <p align="center" class="style2"><a href="Bulletins/08-26-12.pdf">08-26-12</a></p> <p align="center" class="style2"><a href="Bulletins/HNJ 08-19-12.pdf">08-19-12</a><br />New! Now from the right year!</p> }}

}