Path tools should filter out snapping to the procedurally generated contents of its own layer

[Keavon]

For example, a Poisson-Disk Points node which generates circles on the inside of a shape. If you use the Path tool to modify that shape, it wants to snap to is own circles. We only want the Path tool snapping dragged points to other points in the same vector path, not the generated shapes that are derived from it.

[0HyperCube]

@Keavon currently you can snap a point to one of the previous segments in the path assuming it isn't one of the adjacent segments to the one you are moving. This was behaviour copied from Inkscape. Do you wish to keep this behaviour?

If so it is more challenging to identify which data is derived procedurally and which data acts as the original.