Comment 2 for bug 1421842

- reproduced on Windows 7, Inkscape 0.91 r13725 (Jan 30 2015)
- reproduced on Inscape trunk rev 13919.

the problem does not appear to be related to document units. However it may be related to the transform that the text has. If I type in 100 for the spacing, and then click away to lose focus, the 100 converts to 32.01. The text has a transform with x scale = 2.0852 and y scale = 4.68168. The geometric mean of these is 3.12446, and the reciprocal of this is 0.32005, which agrees well with the above observed scaling. Further tests using scaling factors of, say, (4, 4), or (2, 0.5), confirm that the spin box scaling is related to the geometric mean of the transform.

likely a special case of Bug 772057