Which is fine when you have it, but web review UIs and patches in emails are less clear (GitHub does highlight changed words).
@david_chisnall I have only one minor criticism of GitHub's highlighting, and I don't know whether it is (or should be) fixable.
In cases such as the one pictured below, it's necessary to scroll/page down hugely to bring a tiny change into sight.
In other words, 'Show Diff' shows much, much more than the diff.
A wild guess: maybe specific to AsciiDoc in GitHub, or the FreeBSD Documentation Project's use of AsciiDoc in cases such as this.
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