Comment 22 for bug 1239682

I just tried your last fix on a couple of files of mine and it worked but for the 90/96 DPI change. I hope to find time to make deeper and wider tests.
I think that if there's no viewbox it makes sense supposing that the file comes from the historical standard of 90 DPI. Hence a new viewbox with the 96/90 ratio could be defined to fix objects' and page's dimensions while leaving untouched all numbers in the file.