Method _handleSelectAll

packages/main/src/MultiComboBox.ts:1151–1165

()

	}

	_handleSelectAll() {
		const filteredItems = this._getItems().filter(item => item._isVisible && !item.isGroupItem);
		const allItemsSelected = filteredItems.every(item => item.selected);
		this._previouslySelectedItems = filteredItems.filter(item => item.selected).map(item => item);

		filteredItems.forEach(item => {
			item.selected = !allItemsSelected;
		});

		const changePrevented = this.fireSelectionChange();

		if (changePrevented) {
			this._revertSelection();
		}
	}

	_onListHeaderKeydown(e: KeyboardEvent) {
		const isArrowDown = isDown(e);