[docs] [issue32174] nonASCII punctuation characters can not display in python363.chm.

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

It seems impossible to specify the encoding of .chm to ASCII [1], the available encodings of .chm are limited to a list [2].

So I wrote a Sphinx extension for .chm output, it escapes the characters which (codepoint > 0x7F) to 7-bit ASCII. Most escaped characters are: “”’–…—

[1] https://github.com/sphinx-doc/sphinx/blob/master/sphinx/builders/htmlhelp.py#L203-L206
[2] https://github.com/sphinx-doc/sphinx/blob/master/sphinx/builders/htmlhelp.py#L136-L170

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<https://bugs.python.org/issue32174>
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