[cairo] svg and cairo for GUI experiment

[Dominic Lachowicz]

> Now if you want to dynamically alter the content of the SVG itself,
> that's another story, and it doesn't have a happy ending.

The cop-out solution is to just maintain a libxml2 DOM tree and create
a new RsvgHandle whenever the contents change and re-render.

Inefficient? Maybe. But it'll definitely work.

Dom
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