Changing identifier causes dep graph inconsistency

[denisdefreyne]

Changing the identifier of an item or layout can cause an inconsistency in the dependency graph, as the dependency graph’s vertices use the item/layout’s hash, which will have changed.

Steps to reproduce

TO DO

Expected behavior

No crash

Actual behavior

Crash — a (document, vertex) pair exists in the directed graph’s vertex hash, but looking up the vertex for that document yields nil instead of the vertex.

Details

TODO

Crash log

TODO

[denisdefreyne]

CC @gpakosz — this is the issue you were seeing (the bug report is incomplete but I’ll finish it later)