Nyall Dawson 73d0ced5df [FEATURE] Add option to force right-hand-rule during polygon symbol rendering
This new option, available under the "Advanced" button for fill symbols,
allows forcing rendered polygons to follow the standard "right hand
rule" for ring orientation (where exterior ring is clockwise, and
interior rings are all counter-clockwise).

The orientation fix is applied while rendering only, and the original
feature geometry is unchanged.

This allows for creation of fill symbols with consistent appearance,
regardless of the dataset being rendered and the ring orientation
of individual features.

Refs #12652
2018-11-09 19:06:48 +10:00
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