Qiskit visualization ignores control qubit as idle_wires when following a barrier.

[smajumderibm]

Environment

• **Qiskit version: 1.1.0 **:
• Python version: 3.12.5:
• Operating system: MAC:

What is happening?

circuit.draw() is incorrectly drawing circuit with barriers in them.

How can we reproduce the issue?

Returns the right visualization

qc = QuantumCircuit(2)
qc.h(0)
qc.cx(0, 1)
qc.draw(fold=-1, output='mpl', idle_wires=False)

Returns a wrong visualization

qc = QuantumCircuit(2)
qc.h(0)
qc.barrier()
qc.cx(0, 1)
qc.draw(fold=-1, output='mpl', idle_wires=False)

What should happen?

The expected behavior is to include both qubits in the circuit and show the CX gate.

Any suggestions?

No response

[jakelishman]

Are you sure this was with Qiskit 1.1.0? I can't reproduce a bug like that, but there is a known bug in Qiskit 1.2.0 and 1.2.1 that most likely has this effect (see #13128 and #13146, which are fixed by #13149).

[smajumderibm]

My bad, it is in Qiskiit 1.2.1.

[jakelishman]

No worries - in that case this is a duplicated of #13146, and it's just in the process of being fixed by #13149, which will be released in Qiskit 1.2.2, probably later this week. I'll close this as a duplicate for now, but feel free to open more issues if there are more problems.