Whatever the current status and outcome of this report and its discussion in the comments is - there is unlikely a major change pending wrt to viewBox and document drawing scale to be committed to a minor bug-fix release (0.91.1): moving milestone to 0.92 for now.
Whether or not, and how exactly Inkscape 0.92 should add a (missing) viewBox attribute (and thus set an absolute drawing scale) unconditionally when loading a file, and how this will affect or interact with any migration strategies of the internal resolution change for files created with older releases should be discussed on the mailing list.
Feel free to add a comment and request to revert the milestone change if you disagree and think the change was done in error.
Whatever the current status and outcome of this report and its discussion in the comments is - there is unlikely a major change pending wrt to viewBox and document drawing scale to be committed to a minor bug-fix release (0.91.1): moving milestone to 0.92 for now.
Whether or not, and how exactly Inkscape 0.92 should add a (missing) viewBox attribute (and thus set an absolute drawing scale) unconditionally when loading a file, and how this will affect or interact with any migration strategies of the internal resolution change for files created with older releases should be discussed on the mailing list.
Feel free to add a comment and request to revert the milestone change if you disagree and think the change was done in error.