affects only 'git-diff' Porcelain, and not lower level
'diff' commands, such as 'git-diff-files'.
+diff.suppress-blank-empty::
+ A boolean to inhibit the standard behavior of printing a space
+ before each empty output line. Defaults to false.
+
diff.external::
If this config variable is set, diff generation is not
performed using the internal diff machinery, but using the