Fix QuantumCircuit.compose for front=True and individual qargs (backport #15872)#15885
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jakelishman merged 1 commit intostable/2.4from Mar 26, 2026
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(cherry picked from commit 62f74c7)
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jakelishman
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Mar 26, 2026
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When compose() is called with both front=True and a qubits mapping, the original instructions were incorrectly re-appended with the incoming circuit's qubit remap table, causing the error when the circuits had different widths. The fix removes the spurious qubits/clbits arguments from that append, and adds a regression test.
Fix #15834
This is an automatic backport of pull request #15872 done by Mergify.