Keep whitespace in ProcessingInstruction's data field - #212
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See Sec. 2.6 in the XML 1.0 spec for details: https://www.w3.org/TR/2008/REC-xml-20081126/#sec-pi
If you have a look at the actual definition of a Processing instruction
in the XML spec, you'll see that there's no asterisk after the
Whitespace ("S") in the production rule.
[16] PI := '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
According to the XML 1.0 spec, Prod. rule [3], whitespace (S) can also consist of multiple characters. I verified this in Firefox and Chromium -- both trim leading whitespace of the PIData section.
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This fixes Processing Instruction parsing (except for the XML declaration problem, which is fixed by #209), so that whitespace won't be stripped.
Details: https://www.w3.org/TR/2008/REC-xml-20081126/#sec-pi