Sebastian Schuberth [off-list ref] writes:
quoted
The discussion in the last few messages in this thread speculates that the
external programs are more likely to expect representations suitable in
the work tree, aka "smudged", than "clean" one. It would be nice to get a
datapoint from you as the original reporter to confirm or refute that
speculation.
I agree to the speculations. IMHO calling an external diff tool with
two revisions of a file should result in the same as e.g. checking out
the two revisions in two different working trees and then launching
the user's external diff tool on the two working tree files.
Ok.