git-difftool: Add '--gui' for selecting a GUI tool
Users might prefer to have git-difftool use a different tool when run from a Git GUI. This teaches git-difftool to honor 'diff.guitool' when the '--gui' option is specified. This allows users to configure their preferred command-line diff tool in 'diff.tool' and a GUI diff tool in 'diff.guitool'. Reference: http://article.gmane.org/gmane.comp.version-control.git/133386Signed-off-by: NDavid Aguilar <davvid@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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