DR> I don't think amend-record should be responsible.  It ought to be possible
 DR> to reproduce this.  If you grab a repository with one of these two as the
 DR> last patch, unrecord and then record again, does it result in the same
 DR> diff?

The patch I showed in the first message becomes correct after unrecord/record.
The other patch doesn't change, but I found that it's because TAB was
accidentally inserted in the line 7.  Probably a more human-friendly patch
would be this:

hunk ./ChangeLog 1
+2007-08-29  Mickael Remond  <mremond@process-one.net>
+
+	* doc/guide.tex: Documentation for XML based optimisation build
+	time option (EJAB-298)
+
hunk ./ChangeLog 7
-
+^I

but it has the same number of lines, so I think there is no issue with the
second patch.