Added support for forcing font substitution, even if the font is embedded.
Changed behavior - a PdfPage that belongs to a PdfFixedDocument cannot be added to another PdFixedDocument as this can lead to subtle bugs in the generated PDF file.
修补程序
Rotate transform in SVG is not handled correctly in some situations.
Some percentage size and positions in SVG are not handled correctly.
Page with invalid fonts cannot be rendered, throws memory exception.
Text extraction fails with exception when encountering invalid Type0 fonts.
Opacity for fill/stroke in SVG is not handled correctly in some situations.
Hanging parts of characters p,q,g,j,y are cut when filling fields that have height almost identical to font size.