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Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Bug fix
What is the current behavior?
The ids in the graph are not unique: when inserting bus connections or hook nodes, the same id might repeat, for coupling cell in particular. This leads to unwanted behaviour in the TopologicalStyleProvider, whose maps are based on ids, but could also be a problem when interacting with the produced svg.
What is the new behavior (if this is a feature change)?
Special care on created id when inserting bus connection / hook nodes
Does this PR introduce a breaking change or deprecate an API?
No