make diff-highlight use ordinary configurable colors #625
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diff-add-highlight
anddiff-del-highlight
become ordinary colors independently governing the fg/bg/attributes of the highlighted cells.These entries are added to the system tigrc such that the out-of-box configuration is unchanged, though if the user previously customized some diff colors, diff highlight cells will not follow them automatically.
Rationale: independent coloring of four states matches functionality of
diff-highlight
itself. Net reduction of logic. Dimmer colors for the backgrounded regions are a readability improvement.