[cairo] Const correctness?

[Torbjörn Rathsman]

Function retrieving image width:

int cairo_image_surface_get_width (cairo_surface_t *surface);

So, in what way does Cairo modify the surface when I ask for its width?

The same question applies to the other query methods of image surface. Is
this just a badly written prototype? That is, is the following safe:

auto w=cairo_image_surface_get_width(const_cast<cairo_surface_t*>(surface));
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