Take into account that $layerm->perimeters also contains ExtrusionPath objects. #1991
Make sure spiral vase mode is not enabled for multi-island layers. #1938
Rename EMC to LinuxCNC
Improvements to avoid numerical issues in bridge detection and bridge exclusion
Added failing test case for contains_point() not working on Windows. #1950
Fix Polygon::contains_point() overflowing on Windows. #1950