[Bug] Contour logical operator subtract does not create a whole when a fully embedded contour is subtracted from its containing contour

[jbocce]

Describe the Bug

This video demonstrates the bug well.

subraction.mp4

Steps to Reproduce

1. Run the Logical Operations example.
2. On Drawing Segment 1 draw the containing contour. Make it significantly big.
3. On Drawing Segment 2 draw a smaller contour completely contained within the one drawn above.
4. Select to subtract segment 2 from segment 1.
5. Select segment 3 as the output segment.
6. Click the Apply operation button.

The current behavior

The resulting segment does NOT contain a hole as what would be expected.

The expected behavior

Segment 3 in precisely segment 1 with segment 2 removed from segment 1 to form a hole.

System Information

Windows 11
Chrome 140.0.7339.208
Node 23.9.0

[jbocce]

@sedghi I reverted CS3D back to the original commit for the logical operators (i.e. sha 4186790) and this behaviour still existed!