Sorry, I realized just now that there is a problem when opening an old document (90 dpi) with the new 96 dpi value: the whole drawing is resized to 90/96 (93.75%), page size included but not the grids. In fact I noticed the problem for not having the objects aligned to the grid anymore.
How is this supposed to be dealt with? Should one have to manually resize the page and the drawing to 106.666666...%? Which is the best way to accomplish this?
What about our old documents drawn in scale 1:1 and now marked as read-only as they have been archived? I think we need a way to tell Inkscape to still consider them @ 90 dpi, being everything inside them stored as px @ 90 dpi, or provide a quick conversion at loading time. Of course there must be a way for Inkscape to recognize whether a document is using the old or the new value. I think this is essential for not having big troubles in the future.
Also, care is needed for all the cases where this conversion is useless: if the document has been drawn in px, then the dpi are irrelevant (e.g. an icon) and no scaling should be applied. The problem is only in those documents that have mm or inches or so on as document unit.
Hence, user intervention is always required to fix the situation; better if it's reduced to answer "Fix-scale" or "Fix-only" or "Do nothing" to a question like "Fix this old document?" after loading.
Thanks. Luca
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