Comment 3 for bug 171488

My use case is to learn how Open Type fonts are rendered. To do this, I need a coordinate system whose origin starts in the lower left corner. Other use cases include PostScript and PDF, which use the same coordinate system.

In the document options, when I saw the "Scale y" field, I thought everything worked. Only to discover that the "Scale y" field is disabled (always), referring me to the Viewport options below. When I click on the "Scale y" field, this area might open automatically, as a guiding help.

In the Viewbox, I can only set the origin and the width and height, but not the scale. (Didn't the tooltip at "Scale y" promise that I could set it here?)

I tried to set the Height to -29.7, but that was "autocorrected" to 0.01. This is a rather unexpected behavior. I expect that the invalid value is marked as invalid (red background, tooltip, separate error message, anything). Inkscape should not autocorrect numbers, at least not to unreasonable values.