For the most part gitk's focus is on showing history and changes in
a human readable form. For this reason, it makes sense to generate
the patch text in the diff view using --textconv so that textconv
drivers are used if they are defined.
gitk can also generate patches, but we do not use --textconv because
such patches could not be applied.
Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Paul Mackerras <paulus@samba.org>