add--interactive: allow diff colors without interactive colors
Users with color.diff set to true/auto will not see color in "git add -i" unless they also set color.interactive. This changes the semantics of color.interactive to control only the coloring of the interaction aspect of the command and let color.diff to control the color of hunk picker, which would arguably be more convenient. Old $use_color variable is now renamed to $menu_use_color to make it clear that it is about coloring the interaction. The "colored" subroutine now checks if the passed color is defined, instead of checking $use_color variable, to decide if the lines should be colored. The various variables that define colors for different parts of the output are set or unset depending on the setting of color.interactive and color.diff configuration variables. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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