[cairo] Bug in the svg backend

[Maximilian Heinzler]

I found a bug in the svg backend.

 

The problem is the following:

If you use a surface pattern in two different svg documents it is possible
that the source is not written to the second file. This patch should fix
this completely.

 

Note:

There is a test file attached which shows the bug, but because it's a
problem of pointer addresses it may work on some machines without any
mistake.

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