Bad heuristic results in adding inappropriate segmentation to 3D scenes

[jleibs]

Repro:

"""Log a pinhole and a random image."""
import numpy as np
import rerun as rr

rr.init("rerun_example_pinhole", spawn=True)
rng = np.random.default_rng(12345)

image = rng.uniform(0, 255, size=[3, 3, 3])
rr.log("world/camera/image", rr.Pinhole(focal_length=3, width=3, height=3))
rr.log("world/camera/image", rr.Image(image))

image = rng.uniform(0, 255, size=[3, 3, 1])
rr.log("seg", rr.SegmentationImage(image))

Note this only happens with rr.SegmentationImage but not with rr.Image so there's probably some place we need to do a more complete check.

[emilk]

so seg and world/camera/image are added to the same spaceview, despite them not having a common ancestor O.o that's really strange

[Wumpf]

that part isn't that strange since as of 0.8 (or was it 0.7 already?) we sometimes spawn a space view at the root