Removing a row from a QTreeView which has ExtendedSelection deselects all rows and moves the focus to the row before the one removed (unexpected behavior). It does this regardless, even if there's only a single row selected. With SingleSelection it does the opposite, it moves the selection to the next row (expected behavior). This can be reproduced in the official "Editable Tree Model Example" by changing the selection mode of the view in the form designer and running/testing.