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Warn on unescaped Unicode bi-directional control characters #12923

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HertzDevil
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This reintroduces #11393 by reporting those unescaped characters as parser warnings instead, which were unavailable when that PR was created.

IMO this is the minimum that the compiler should do. See #11392.

@straight-shoota
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I think this patch is good to be merged. But I'd also like it to be accompanied by a formatter change to reformat code with these characters.

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