Method _handlePageUp

packages/main/src/ComboBox.ts:1004–1011

(e: KeyboardEvent, indexOfItem: number)

	}

	_handlePageUp(e: KeyboardEvent, indexOfItem: number) {
		const allItems = this._getItems();
		const isProposedIndexValid = indexOfItem - SKIP_ITEMS_SIZE > -1;
		indexOfItem = isProposedIndexValid ? indexOfItem - SKIP_ITEMS_SIZE : 0;
		const shouldMoveForward = isInstanceOfComboBoxItemGroup(allItems[indexOfItem]) && !this.open;

		this._handleItemNavigation(e, indexOfItem, shouldMoveForward);
	}

	_handlePageDown(e: KeyboardEvent, indexOfItem: number) {
		const allItems = this._getItems();