Created attachment 195658 [details]
A rectangle 1 by 2 mm

The attachment is as simple as:

<?xml version="1.0" encoding="UTF-8"?>
<svg version="1.2" width="1mm" height="2mm" viewBox="0 0 1 2" xmlns="http://www.w3.org/2000/svg">
 <g>
  <rect x="0" y="0" width="1" height="2"/>
 </g>
</svg>

It is a file with viewBox of 1x2 from [0, 0]; the user units of mm; and a single rectangle 1x2 from [0, 0] (so covering 100% of the viewBox).

It is expected, that importing this, Draw would use the document information to construct its document model (as always should be done with any document we import: we take page size from DOCX, XLS, ... - whenever that info is there). Here, the document dictates the page size clearly - it must be 1 x 2 mm; and the rectangle on it must be 1 x 2 mm, positioned at point [0, 0].

In reality, the page is 1.26 x 2.26 mm; the rectangle is 0.98 x 1.98 mm (which is intolerable in this specific case, where both SVG uses mm, and Draw's internal units are mm/100, so must result in exact whole numbers); and the position of the rectangle is [0.06 mm, 0.06 mm].

This is not just a curious non-issue. Take any SVG having a clear definition of their box; and convert-to a raster image. The end result will always have one too many pixels on X and Y, and the object boundaries aligned to SVG units will all be in the middle of resulting pixels, creating blurry edges. Doing this with this attachment would not create a proper totally black image with proportions 1 : 2, but a 5x9 bitmap with unexpected white and grey borders.