Never join coincident start/end points of LineStrings #4413
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Test case and gl-js side fix for mapbox/mapbox-gl-native#7714.
Before, a LineString feature (green) with coincident end points may or may not be joined, depending on how it gets clipped to tiles.
After, it will always be rendered as a line, not a polygon.
Polygon features (blue) are always rendered as such. No behavioral change for them.
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