SVG element <use> clips negative coordinates

Howdy!

Currently cairo-svg uses the <use> element to render glyphs.  Such glyphs have
their origin at baseline-left, which is typical in text rendering.  This works
fine with librsvg.

However, as observed in Firefox and Chrome, and hidden in the spec, the <use>
element clips its content to a rectangle.  When width and height are left
unset, they expand to 100%, the result being that in a line like this:

  <use xlink:href="#glyph4-11" x="50" y="50"/>

only the first quadrant is rendered.

Test image attached.

Federico: librsvg needs to be fixed to do the (stupid) clipping...

Cheers,
-- 
behdad
http://behdad.org/

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