System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 965M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-16 21:05, hash: rB27660b3cd90d
Worked: 2.9

Short description of error
If there is an object with a parent below a colored collection, also the line of the parent gets the same color, even if it's not part of the collection.

Exact steps for others to reproduce the error
Open Blender (latest 2.91 alpha), create three objects, put one in a collection, leaving the other two outside. Parent one of the remaining two to the other, then select the collection above the objects outside and color it.