Bug fix: Inner Outer Inner wall ordering mode failed to reorder in certain edge cases with arachne

[igiannakas]

Description

In certain cases where the internal perimeter line width was significantly larger than the external perimeter line width, IOI mode failed to re order the external perimeters correctly.

This was due to the safety margin for perimeter overlap (10%) that was introduced in the previous IOI rework PR.

Reducing this to 2%, just to cover edge cases caused due to numerical precision, fixes these edge cases while also retaining correct wall ordering.

Can reduce to 0% with the wall ordering still working correctly; however the slight increase in the search radius helps mitigate potential numerical precision issues where the neighbouring perimeter is just a "hair" further apart than the computed search radius.

Screenshots/Recordings/Graphs

Before
The middle bridge was incorrectly "attached" to the previous island due to proximity calculation being tripped up due to the artificially increased overlap.

After:
Correctly sequenced perimeters as per IOI

[TomKamin1]

Hi! I am the edge case, and the problem is completely solved. Here's a before and after of how the problem looked on the part.

[igiannakas]

@SoftFever, any chance we can sneak that in 2.2? 😀😀