Problem: diff() function uses 'diffexpr'
(rickhowe)
Solution: Make diff() always use internal diff(), add support for
unified diff context length, sort diff() options in help
(Yegappan Lakshmanan)
fixes: #13989closes: #14010
Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>