QCss::Parser does not handle spacing between «@charset» and following string.

When including a CSS file in a HTML file sent to QTextDocument, and the CSS file starts with «@charset "UTF-8";», which is the correct way of declaring that, the parsing fails.

If you omit the space, like «@charset"UTF-8";» the parsing succeeds, which is wrong.

The bug is at line 2179 or so in src/gui/text/qcssparser.cpp, but I'm not sure what the correct way to get it to process the whitespace there is.