Blender Git Commit Log

Fix (studio reported) crash on Undo in some cases.

Would crash when adding or removing a collection directly to the master
collection of a scene.

Consequence of change to handle depsgraph-controlled evaluation of some
IDs (like excluded collections which do not get evaluated and do not get
a COW anymore). See rBcf4258673755 and D10907.

Note that this mostly demonstrates once again how weak and flacky our
handling of embedded IDs still remains, with some part of the code
handling them as independent IDs, some as fully local/private data, some
as a mix of both... and lots and lots of custom handling code and corner
cases that are a bottomless pit of issues.

Also quiet incredible that this was not reported already, luckily this
original change did not make it to 2.93 release.