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由 Johannes Schindelin 提交于
When diffing diffs, it can be quite daunting to figure out what the heck is going on, as there are nested +/- signs. Let's make this easier by adding a flag in diff_options that allows color-coding the outer diff sign with inverted colors, so that the preimage and postimage is colored like the diff it is. Of course, this really only makes sense when the preimage and postimage *are* diffs. So let's not expose this flag via a command-line option for now. This is a feature that was invented by git-tbdiff, and it will be used by `git range-diff` in the next commit, by offering it via a new option: `--dual-color`. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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