https://forum.qt.io/topic/9691/meet-problem-when-use-qtreewidgetitem-dontshowindicator
Meet problem when use "QTreeWidgetItem::DontShowIndicator" | Qt Forum
Sep 23, 2011 - when I use setChildIndicatorPolicy(QTreeWidgetItem::DontShowIndicator) with a node, then the node's children can't be shown, collapse/expand can't be used, b...
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