If start is greater than or equal to end , nothing is done. Nothing happens if item is out of bounds. Nothing happens if item is out of bounds. Zero or one element may be selected. Any number of elements may be selected.
Clicks toggle the state of an item.
Any number of elements may be selected. Selects all children of list . A signal will be emitted for each newly selected child. Unselects all children of list . A signal will be emitted for each newly unselected child.