gtk:selection-model-unselect-range (model pos n-items)

model -- a gtk:selection-model object
pos -- an unsigned integer for the first item to unselect
n-items -- an unsigned integer for the number of items to unselect

True if this action was supported and no fallback should be tried. This does not mean the range was unselected.

Requests to unselect a range of items in the model.