> With -D option diff makes `#ifdef' format output with conditional
> preprocessor directives.  Currently diff-mode.el uses hard-coded
> font-lock-string-face to highlight them.  The patch adds a new face
> to allow users to configure it.  By default, it inherits from
> font-lock-preprocessor-face.

The "^#.*" pattern is meant to match "comment lines".  These are part of an
extension of the diff format.  It has nothing to do with the -D option
which I do not consider as outputting a diff format and diff-mode does not
support this output format in any way.


        Stefan


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