there is a difference between Inkscape 0.48.5 and current trunk with respect to this issue. In Inkscape 0.48.5 a change in document units is not undone by ctrl-Z.
in 0.48.5: - draw object - change document units - hit ctrl-Z, object disappears but the new units are kept - hit ctrl-Z again, nothing happens
in trunk, rev 13534: - draw object (preferably not a rectangle) - change document units - hit ctrl-Z, units revert back to original - hit ctrl-Z again, object disappears
Personally I prefer the behavior of Inkscape 0.48.5. It seems to me that ctrl-Z should apply only to visible objects, and document units is not a visible object.
Apart from that, the current behavior leads to a crash if you use a rectangle, see: https://bugs.launchpad.net/inkscape/+bug/1348382
thoughts? Alvin
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