[cairo] Regression in stroker

[Adrian Johnson]

Adrian Johnson wrote:
> The attached PDF when viewed with the latest git poppler and cairo has a
> round cap missing and one of the round joins has been clipped.
> 
> According to git bisect the regression was introduced by the cairo commit:
> 
>   afbd82671fe5ebebe5d58bef3d372312be1c5aeb
>   "Optimize stroker by hoisting some calculations out of loops"

Attached is a test case that demonstrates the bug. All non horizontal
lines are missing the round caps. One of the round joins has been flattened.

The bug appears to be triggered by the call to cairo_set_matrix() that
flips the y axis. Removing that call will cause the test to render
correctly.

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