update comment

src/components/SelectionList/BaseSelectionList.tsx

@@ -99,10 +99,10 @@ function BaseSelectionList<TItem extends ListItem>(
     const incrementPage = () => setCurrentPage((prev) => prev + 1);
 
     /**
-     * Iterates through the sections and items inside each section, and builds 3 arrays along the way:
+     * Iterates through the sections and items inside each section, and builds 4 arrays along the way:
      * - `allOptions`: Contains all the items in the list, flattened, regardless of section
-     * - `disabledOptionsIndexes`: Contains the indexes of all the unselectable (isDisabledCheckbox) and disabled items in the list
-     * - `disabledArrowKeyOptionsIndexes`: Contains the indexes of all the disabled items in the list, to be used by the ArrowKeyFocusManager
+     * - `disabledOptionsIndexes`: Contains the indexes of all the unselectable and disabled items in the list
+     * - `disabledArrowKeyOptionsIndexes`: Contains the indexes of item that is not navigatable by the arrow key. The list is separated from disabledOptionsIndexes because unselectable item is still navigatable by the arrow key.
      * - `itemLayouts`: Contains the layout information for each item, header and footer in the list,
      * so we can calculate the position of any given item when scrolling programmatically
      */
@@ -132,10 +132,11 @@ function BaseSelectionList<TItem extends ListItem>(
                 });
 
                 // If disabled, add to the disabled indexes array
+                const isItemDisabled = !!section.isDisabled || (item.isDisabled && !item.isSelected);
                 // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-                if (!!section.isDisabled || (item.isDisabled && !item.isSelected) || item.isDisabledCheckbox) {
+                if (isItemDisabled || item.isDisabledCheckbox) {
                     disabledOptionsIndexes.push(disabledIndex);
-                    if (!!section.isDisabled || item.isDisabled) {
+                    if (isItemDisabled) {
                         disabledArrowKeyOptionsIndexes.push(disabledIndex);
                     }
                 }