Comment 4 for bug 1459795

Another option to keep the matrix() transformation as preserved transformation for the bitmap image would be - (in the original, externally created SVG document) - to wrap the image into a <g> element, and to apply the matrix() transformation to the group. This will then "work" in Inkscape even if the <image> has the default 'xMidYMid' value for 'preserveAspectRatio' (since the group will be transformed), and will also "survive" copy&paste into a new document, or otherwise transforming (e.g. translating aka moving) the group within the original document.