[storybook] Move row height stories to their own file/subdir

- allows us to expand props documentation & use controls for `rowHeightsOptions`

+ add test for lineHeight

packages/eui/src/components/datagrid/data_grid.stories.tsx

@@ -60,79 +60,6 @@ export const Virtualization: Story = {
   render: (args: EuiDataGridProps) => <StatefulDataGrid {...args} />,
 };
 
-export const HeightLineCount: Story = {
-  parameters: {
-    controls: {
-      include: ['gridStyle', 'rowHeightsOptions', 'width', 'height'],
-    },
-  },
-  args: {
-    ...defaultStorybookArgs,
-    rowCount: 5,
-    width: '700px',
-    toolbarVisibility: false,
-    rowHeightsOptions: {
-      defaultHeight: {
-        lineCount: 1,
-      },
-      lineHeight: undefined,
-      scrollAnchorRow: undefined,
-    },
-  },
-  render: (args: EuiDataGridProps) => <StatefulDataGrid {...args} />,
-};
-
-export const RowHeight: Story = {
-  parameters: {
-    controls: {
-      include: ['gridStyle', 'rowHeightsOptions', 'width', 'height'],
-    },
-  },
-  args: {
-    ...defaultStorybookArgs,
-    rowCount: 5,
-    toolbarVisibility: false,
-    rowHeightsOptions: {
-      defaultHeight: {
-        height: 48,
-      },
-      rowHeights: {},
-      lineHeight: undefined,
-      scrollAnchorRow: undefined,
-    },
-  },
-  render: (args: EuiDataGridProps) => <StatefulDataGrid {...args} />,
-};
-
-export const CustomRowHeights: Story = {
-  parameters: {
-    controls: {
-      include: ['gridStyle', 'rowHeightsOptions', 'width', 'height'],
-    },
-  },
-  args: {
-    ...defaultStorybookArgs,
-    rowCount: 5,
-    width: '700px',
-    toolbarVisibility: false,
-    rowHeightsOptions: {
-      defaultHeight: {
-        lineCount: 1,
-      },
-      rowHeights: {
-        2: 'auto',
-        3: 48,
-        4: {
-          height: 48,
-        },
-      },
-      lineHeight: undefined,
-      scrollAnchorRow: undefined,
-    },
-  },
-  render: (args: EuiDataGridProps) => <StatefulDataGrid {...args} />,
-};
-
 const CustomHeaderCell = ({ title }: { title: string }) => (
   <>
     <span>{title}</span>

packages/eui/src/components/datagrid/data_grid.stories.utils.tsx

@@ -27,6 +27,7 @@ import type {
   EuiDataGridColumnSortingConfig,
   EuiDataGridProps,
   EuiDataGridStyle,
+  EuiDataGridRowHeightsOptions,
   EuiDataGridToolBarVisibilityOptions,
   EuiDataGridToolBarAdditionalControlsOptions,
 } from './data_grid_types';
@@ -382,3 +383,7 @@ export const EuiDataGridToolbarPropsComponent: FunctionComponent<
 export const EuiDataGridStylePropsComponent: FunctionComponent<
   EuiDataGridStyle
 > = () => <></>;
+
+export const EuiDataGridRowHeightsPropsComponent: FunctionComponent<
+  EuiDataGridRowHeightsOptions
+> = () => <></>;

packages/eui/src/components/datagrid/data_grid_row_heights.stories.tsx

@@ -0,0 +1,101 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import React from 'react';
+import type { Meta, StoryObj } from '@storybook/react';
+import { enableFunctionToggleControls } from '../../../.storybook/utils';
+
+import {
+  StatefulDataGrid,
+  defaultStorybookArgs,
+  EuiDataGridRowHeightsPropsComponent,
+} from './data_grid.stories.utils';
+import type { EuiDataGridRowHeightsOptions } from './data_grid_types';
+
+const meta: Meta<EuiDataGridRowHeightsOptions> = {
+  title: 'Tabular Content/EuiDataGrid/Row Heights',
+  component: EuiDataGridRowHeightsPropsComponent,
+  parameters: {
+    codeSnippet: {
+      snippet: `<EuiDataGrid rowHeightOptions={{{STORY_ARGS}}} />`,
+    },
+  },
+};
+enableFunctionToggleControls(meta, ['onChange']);
+
+export default meta;
+type Story = StoryObj<EuiDataGridRowHeightsOptions>;
+
+const storyArgs = {
+  ...defaultStorybookArgs,
+  width: 800, // make it easier to test wrapping text
+  rowCount: 5, // make VRT screenshots smaller
+};
+
+export const Auto: Story = {
+  args: {
+    defaultHeight: 'auto',
+  },
+  render: (rowHeightsOptions) => (
+    <StatefulDataGrid {...storyArgs} rowHeightsOptions={rowHeightsOptions} />
+  ),
+};
+
+export const LineCount: Story = {
+  args: {
+    defaultHeight: { lineCount: 2 },
+  },
+  render: (rowHeightsOptions) => (
+    <StatefulDataGrid
+      {...storyArgs}
+      rowHeightsOptions={rowHeightsOptions}
+      // Visual regression test for https://github.com/elastic/eui/issues/7780
+      // Last two rows of the 'Location' column should *not* have any
+      // barely visible text below the ... line-clamp truncation
+      gridStyle={{ fontSize: 'm', cellPadding: 'l' }}
+    />
+  ),
+};
+
+export const StaticHeight: Story = {
+  args: {
+    defaultHeight: { height: 48 },
+  },
+  render: (rowHeightsOptions) => (
+    <StatefulDataGrid {...storyArgs} rowHeightsOptions={rowHeightsOptions} />
+  ),
+};
+
+export const CustomRowHeights: Story = {
+  parameters: { controls: { include: ['rowHeights'] } },
+  args: {
+    rowHeights: {
+      2: 'auto',
+      3: 48,
+      4: {
+        height: 56,
+      },
+      5: {
+        lineCount: 2,
+      },
+    },
+  },
+  render: (rowHeightsOptions) => (
+    <StatefulDataGrid {...storyArgs} rowHeightsOptions={rowHeightsOptions} />
+  ),
+};
+
+export const CustomLineHeight: Story = {
+  parameters: { controls: { include: ['lineHeight'] } },
+  args: {
+    lineHeight: '40px',
+  },
+  render: (rowHeightsOptions) => (
+    <StatefulDataGrid {...storyArgs} rowHeightsOptions={rowHeightsOptions} />
+  ),
+};