[OpenJDK 2D-Dev] RFR[14]: JDK-8230728 : Thin stroked shapes are not rendered if affine transform has flip bit

[Laurent Bourgès]

Hi,

Please review this bug fix for the Marlin renderer (present in Pisces code
since JDK 6?):
JBS: https://bugs.openjdk.java.net/browse/JDK-8230728
webrev: http://cr.openjdk.java.net/~lbourges/marlin/marlin-8230728.0/

This patch fixes a NaN handling in userSpaceLineWidth() when the affine
transform determinant is negative (flip bit is ON)

Changes:
- MarlinRenderingEngine: use abs(at.getDeterminant()) to ensure positive
value before using sqrt
- FlipBitTest: new jtreg test reproducing the original problem drawing a
thin ellipse with a flipped transform

Cheers,
Laurent
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