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Extend bzr to also pass added and deleted files to the external diff
tool when "bzr diff --using" is called.<br>
<br>
The diff tool will be given an empty file to compare the deleted or
added file against<br>
as the new or old file respectively. The consequence is that the
deleted or added file will be shown in the<br>
diff tool on the appropriate side with nothing shown on the other side.<br>
<br>
The empty file will be placed in the root of the <br>
temporary tree created for performing the diff (not in the "new" or
"old" sub-trees) to avoid <br>
name conflicts and will be called "does_not_exist".<br>
<br>
Feel free to be extra critical <span class="moz-smiley-s3"><span> ;-) </span></span>
as this is my first submission to bzr <b>and</b> my first work with
python.<br>
<br>
David.<br>
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