Fix propagation of items and groups props from DetailsList through Gr…

…oupedList (#15605)

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#### Pull request checklist

- [ ] Addresses an existing issue: Fixes #0000
- [x] Include a change request file using `$ yarn change`

#### Description of changes

_Cherry-pick of #15321._

_Original PR description:_

Fixed an issue in the recent rework to use `getDerivedStateFromProps` in the `GroupedList` component: the new function was inadvertently checking new input props values *against themselves* rather than the previous state. This issue is now fixed, and the `DetailsList` input state now propagates correctly through `GroupedList`.

Added some unit tests for `DetailsList` explicitly in order to validate that re-rendering a `DetailsList` with new inputs for `items` or `groups` properly updates for each type of transition.

#### Focus areas to test

Validate `DetailsList` when changing the `items` or `groups` props. Added a unit test explicitly for this.

change/@fluentui-react-2020-10-19-18-11-59-listGroupPropagation.json

@@ -0,0 +1,8 @@
+{
+  "type": "minor",
+  "comment": "Fixing propagation of items and groups props from DetailsList through GroupedList.",
+  "packageName": "@fluentui/react",
+  "email": "humbertomakotomorimoto@gmail.com",
+  "dependentChangeType": "patch",
+  "date": "2020-10-20T01:11:59.934Z"
+}

packages/react/etc/react.api.md

@@ -1666,12 +1666,14 @@ export interface IGroupedListSectionState {
 // @public (undocumented)
 export interface IGroupedListState {
     // (undocumented)
-    groups?: IGroup[];
+    compact?: IGroupedListProps['compact'];
     // (undocumented)
-    lastSelectionMode?: SelectionMode;
+    groups?: IGroup[];
     // (undocumented)
     listProps?: IGroupedListProps['listProps'];
     // (undocumented)
+    selectionMode?: IGroupedListProps['selectionMode'];
+    // (undocumented)
     version: {};
 }
 

packages/react/src/components/DetailsList/DetailsList.test.tsx

@@ -3,17 +3,24 @@ import * as ReactDOM from 'react-dom';
 import * as renderer from 'react-test-renderer';
 import { ReactWrapper } from 'enzyme';
 import { safeMount } from '@uifabric/test-utilities';
-import { DetailsList } from './DetailsList';
-import { DetailsListBase } from './DetailsList.base';
-
-import { IDetailsList, IColumn, DetailsListLayoutMode, CheckboxVisibility } from './DetailsList.types';
-import { IDetailsColumnProps } from './DetailsColumn';
-import { IDetailsHeaderProps, DetailsHeader } from './DetailsHeader';
-import { EventGroup, IRenderFunction } from '../../Utilities';
+import { KeyCodes } from '@uifabric/utilities';
 import { IDragDropEvents } from '../../DragDrop';
+import { IGroup } from '../../GroupedList';
 import { SelectionMode, Selection, SelectionZone } from '../../Selection';
 import { getTheme } from '../../Styling';
-import { KeyCodes } from '@uifabric/utilities';
+import { EventGroup, IRenderFunction } from '../../Utilities';
+import { IDetailsColumnProps } from './DetailsColumn';
+import { IDetailsHeaderProps, DetailsHeader } from './DetailsHeader';
+import { DetailsList } from './DetailsList';
+import { DetailsListBase } from './DetailsList.base';
+import {
+  CheckboxVisibility,
+  DetailsListLayoutMode,
+  IColumn,
+  IDetailsGroupDividerProps,
+  IDetailsList,
+} from './DetailsList.types';
+import { IDetailsRowProps } from './DetailsRow';
 
 // Populate mock data for testing
 function mockData(count: number, isColumn: boolean = false, customDivider: boolean = false): any {
@@ -484,4 +491,151 @@ describe('DetailsList', () => {
       },
     );
   });
+
+  it('handles updates to items and groups', () => {
+    const tableOneItems = [
+      {
+        f1: 'A1',
+        f2: 'B1',
+        f3: 'C1',
+      },
+      {
+        f1: 'A2',
+        f2: 'B2',
+        f3: 'C2',
+      },
+      {
+        f1: 'A3',
+        f2: 'B3',
+        f3: 'C3',
+      },
+      {
+        f1: 'A4',
+        f2: 'B4',
+        f3: 'C4',
+      },
+    ];
+    const tableTwoItems = [
+      {
+        f1: 'D1',
+        f2: 'E1',
+        f3: 'F1',
+      },
+      {
+        f1: 'D2',
+        f2: 'E2',
+        f3: 'F2',
+      },
+      {
+        f1: 'D3',
+        f2: 'E3',
+        f3: 'F3',
+      },
+      {
+        f1: 'D4',
+        f2: 'E4',
+        f3: 'F4',
+      },
+    ];
+
+    const groupOneGroups: IGroup[] = [
+      { key: 'one-1', name: 'one 1', count: 1, startIndex: 0 },
+      { key: 'one-2', name: 'one 2', count: 1, startIndex: 1 },
+      { key: 'one-3', name: 'one 3', count: 1, startIndex: 2 },
+      { key: 'one-4', name: 'one 4', count: 1, startIndex: 3 },
+    ];
+
+    const groupTwoGroups: IGroup[] = [
+      { key: 'two-1', name: 'two 1', count: 2, startIndex: 0 },
+      { key: 'two-2', name: 'two 2', count: 2, startIndex: 2 },
+    ];
+
+    const onRenderDetailsHeader: IRenderFunction<IDetailsHeaderProps> = (headerProps: IDetailsHeaderProps) => {
+      return (
+        <div>
+          {headerProps.columns.map((column: IColumn) => {
+            return <div key={column.key}>{column.name}</div>;
+          })}
+        </div>
+      );
+    };
+
+    const onRenderRow = (rowProps: IDetailsRowProps) => {
+      return (
+        <div>
+          {rowProps.columns.map((column: IColumn) => {
+            return <div key={column.key}>{rowProps.item[column.key]}</div>;
+          })}
+        </div>
+      );
+    };
+
+    const onRenderGroupHeader: IRenderFunction<IDetailsGroupDividerProps> = (
+      groupDividerProps: IDetailsGroupDividerProps,
+    ) => {
+      return <div>{groupDividerProps.group?.name}</div>;
+    };
+
+    const component = renderer.create(
+      <DetailsList
+        onRenderDetailsHeader={onRenderDetailsHeader}
+        onRenderRow={onRenderRow}
+        groupProps={{ onRenderHeader: onRenderGroupHeader }}
+        items={tableOneItems}
+        groups={groupOneGroups}
+        layoutMode={DetailsListLayoutMode.fixedColumns}
+        skipViewportMeasures={true}
+      />,
+    );
+
+    expect(component.toJSON()).toMatchSnapshot();
+
+    // New items, same groups
+
+    component.update(
+      <DetailsList
+        onRenderDetailsHeader={onRenderDetailsHeader}
+        onRenderRow={onRenderRow}
+        groupProps={{ onRenderHeader: onRenderGroupHeader }}
+        items={tableTwoItems}
+        groups={groupOneGroups}
+        layoutMode={DetailsListLayoutMode.fixedColumns}
+        skipViewportMeasures={true}
+      />,
+    );
+
+    expect(component.toJSON()).toMatchSnapshot();
+
+    // Same items, new groups
+
+    component.update(
+      <DetailsList
+        onRenderDetailsHeader={onRenderDetailsHeader}
+        onRenderRow={onRenderRow}
+        groupProps={{ onRenderHeader: onRenderGroupHeader }}
+        items={tableTwoItems}
+        groups={groupTwoGroups}
+        layoutMode={DetailsListLayoutMode.fixedColumns}
+        skipViewportMeasures={true}
+      />,
+    );
+
+    expect(component.toJSON()).toMatchSnapshot();
+
+    // New items, same groups
+
+    component.update(
+      <DetailsList
+        onRenderDetailsHeader={onRenderDetailsHeader}
+        onRenderRow={onRenderRow}
+        groupProps={{ onRenderHeader: onRenderGroupHeader }}
+        items={tableOneItems}
+        groups={groupTwoGroups}
+        layoutMode={DetailsListLayoutMode.fixedColumns}
+        skipViewportMeasures={true}
+      />,
+    );
+
+    expect(component.toJSON()).toMatchSnapshot();
+  });
 });