with emacs -Q, I can use M-x whitespace-mode :
But in diff-mode, if I use M-x whitespace-mode this is what I get:
you can see the tabs/space/newlines aren't shown (highlighted).
How can I make diff-mode show whitespace like first image?
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John Doe
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The question is not clear: whether you want to enable `whitespace-mode` in `diff-mode`, or keep whitespace highlighting from the original buffer, for example, by changing diff colors from background to foreground. – link0ff Feb 09 '22 at 19:29
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@link0ff edited. I want to enable `whitespace-mode` – John Doe Feb 10 '22 at 20:03
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For clarity, if you use `M-x whitespace-mode` in a diff buffer, that has the desired visual effect? And you just want to know how to automate that? – phils Feb 13 '22 at 03:18
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No it does not have desired effect. I edited the question. – John Doe Feb 14 '22 at 23:14