The multilabel segmentation utilities view shows a large gap between two single node selection widgets after the QmitkDataSelectionWidget was refactored in T27034.
Setting the size policy of each included QmitkDataSelectionWidget to minimum and fixed will remove the gap between multiple selection widgets that have been added using QmitkDataSelectionWidget::AddDataSelection.
Before:
{F1828198}
After:
{F1828226}