To be fair, "whitespace: pre-wrap" means whitespace should be preserved. And Sigil should not be adding (or removing) space inside.
The problem is "pre-wrap" is not one of the required supported values in the ePub spec, so ePub renderers are not required to recognize it, but nothing prevents them doing so. What should Sigil do in this case then? Surely, we can't expect it to support every possible CSS value ever imagined (because CSS allows renderers to recognize custom properties or values), but maybe at least the CSS2.1 ones.
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