Comment 35 for bug 1389723

Hi LucaDC.
Yes icons are similar problem to display or web objects. I think the best option is:
Ask to the user in the extension/prompt at open if the document is for pixels or for units, maybe better from display or print and make the extensions work as the user tell

in display documents you need also scale sometimes the grid -for 0.92 expected behabiour- and maybe, not sure, guides