Comment 13 for bug 1239682

<opinion>
Revision 13938 will break a lot of old files created with Inkscape 0.48 - whenever the user chose a different display (aka default) unit than px in Inkscape 0.48, the content of the file when opened in trunk >= rev 13938 will be scaled wrongly and no longer match the page size. Basing the auto-added viewBox on _display_ units seems an odd choice to me (display units do not and never did in a stable release affect the drawing scale).
</opinion>