Unhandled exception: AttributeError: 'ConfigPlugin' object has no attribute 'getCmdlineValue'

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### Step 2: Describe the problem:

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#### Observed Results:

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#### Expected Results:

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The report only identifies an AttributeError involving ConfigPlugin.getCmdlineValue and provides no environment, reproduction steps, file, or test. Start by locating ConfigPlugin and references to getCmdlineValue, then reproduce the failure and identify a focused regression test that demonstrates the expected behavior.

Written by the indexing model from the issue text.