flagsImGuiMultiSelectFlags options controlling this operation; combine compatible flag bits with |.
selection_sizeCurrent number of selected items, or -1 if unknown.
items_countTotal selectable item count, or -1 if unknown; used by selection request handlers.
Borrowed multi-selection IO containing requests to apply before submitting items. Always pair with EndMultiSelect(), and apply its requests too.
Begin a scope for multi-item and range selection interactions.