If you have a QSplitter and you make any widget a child of that QSplitter, that QSplitter will count that widget with QSplitter::count and return that widget in its QSplitter::widget even though that child widget was never added with QSplitter::addWidget or QSplitter::insertWidget. This is bad behavior. QSplitter's behavior should be to only account for widgets which were properly put under its control, not all widgets which may have been made children of it, such as tool windows and other popups, etc. (This bug could possibly affect other container widgets such as QTabSplitter as well.)