SciTools / cartopy / 28825333403 / 1

84%

main: 84%

Pull #2685

github

Always merge MultiLineString when checking grid label intersections

Sometimes, Shapely will produce a `MultiLineString` with multiple parts
that coincide (most notably on macOS for `LambertConformal`), causing
potential labels to be placed in slightly different places, and then
different ones to be visible due to overlap.

By merging the intersection of the lines and map boundary, we can ensure
that potential labels are placed in consistent spots, and there should
not be any platform-specific changes to lable visibility.

Unfortunately, there does still appear to be a bit of inconsistency
between platforms as far as normalization goes, so we need to fall back
to the original intersection result if we are merging a large number of
sub-geometries.

1223 of 1712 branches covered (71.44%)

4483 of 5319 relevant lines covered (84.28%)

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