I am trying to write a plugin for
\Magento\ImportExport\Model\Import\AbstractSource::current
using
<type name="Magento\ImportExport\Model\Import\AbstractSource">
<plugin name="firegento_extendedimport_trim_row_data" type="FireGento\ExtendedImport\Plugin\TrimRowData" />
</type>
I also tried
<type name="Magento\ImportExport\Model\Import\Source\Csv">
<plugin name="firegento_extendedimport_trim_row_data" type="FireGento\ExtendedImport\Plugin\TrimRowData" />
</type>
But in the debugger the interceptor just does not seem to be generated.