Qiskit / qiskit / 9418723844

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Commit Message

Fix `QuantumCircuit.depth` with zero-operands and `Expr` nodes (#12429) (#12528)

This causes `QuantumCircuit.depth` to correctly handle cases where a
circuit instruction has zero operands (such as `GlobalPhaseGate`), and
to treat classical bits and real-time variables used inside `Expr`
conditions as part of the depth calculations.  This is in line with
`DAGCircuit`.

This commit still does not add the same `recurse` argument from
`DAGCircuit.depth`, because the arguments for not adding it to
`QuantumCircuit.depth` at the time still hold; there is no clear meaning
to it for general control flow from a user's perspective, and it was
only added to the `DAGCircuit` methods because there it is more of a
proxy for optimising over all possible inner blocks.

(cherry picked from commit d18a74cd4)

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

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