Add a comment on subgraph id generation #2711
Merged
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What does this change?
Add a comment describing why subgraph identifiers persist when components become disconnected as this behaviour is non-trivial to understand.
Closes: #2709
How to test
How can we measure success?
Developers trying to understand the behaviour of the matcher will be less confused.
Have we considered potential risks?
This only adds a comments (behaviour is already covered by tests).