Function to let a user of the library specify the SVG's dimensions
See the documentation for [method@Rsvg.Handle.set_size_callback] for an example, and for the reasons for deprecation.
Deprecated: Use [method@Rsvg.Handle.render_document] instead, which lets you specify a viewport size in which to render the SVG document.
See Implementation
Function to let a user of the library specify the SVG's dimensions
See the documentation for [method@Rsvg.Handle.set_size_callback] for an example, and for the reasons for deprecation.