Warning: DimensionData is deprecated since 2.46..
Dimensions of an SVG image from [method@Rsvg.
Use [method@Rsvg.Handle.get_intrinsic_size_in_pixels] or [method@Rsvg.Handle.get_geometry_for_layer] instead.
Handle.get_dimensions], or an individual element from [method@Rsvg.Handle.get_dimensions_sub]. Please see the deprecation documentation for those functions.