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Why QTreeView only expands on doubleclicks on some of the columns?

  • I have QTreeView with data supplied with QItemSelectionModel with 2 columns.
    These were called from the tree constructor:

    But for some reason only doubleclicks on the first column expand the items. And doubleclicks on the second columns do nothing.
    How can I understand why doubleclicks on the second column don't expand the items in the tree?

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