QThreeWidgetItems that have been removed from their parents (or the widget) must be deleted manually. The treeWidgetModel() test forgot that, driving asan nuts. Code predates the beginning of the public history, so picking to all active branches. Change-Id: I139549b0bd8baf4abfb90f926f6290119471046f Reviewed-by: Ivan Solovev <ivan.solovev@qt.io> (cherry picked from commit 51edc438dd88d3260b6d824a95d4b4782c59fb03) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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