[Emotion] Use patched Emotion library to resolve Flyout System issue (elastic#256086)

## Summary

Closes elastic#255318


### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- ~[ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)~
- ~[ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials~
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- ~[ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)~
- ~[ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.~
- ~[ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed~
- ~[ ] The PR description includes the appropriate Release Notes
section, and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)~
- ~[ ] Review the [backport
guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.~

### Identify risks

Does this PR introduce any risks? For example, consider risks like hard
to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified
risk. Invite stakeholders and evaluate how to proceed before merging.

- [x] Added a `resolution` field for `@emotion/sheet` to use an [Elastic
fork](https://github.com/elastic/emotion) ([see
diff](emotion-js/emotion@main...elastic:emotion:main)).
We trust any issue this may add can be caught by functional tests,
especially the new one added.

---------

Co-authored-by: Tomasz Kajtoch <tomasz.kajtoch@elastic.co>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

Author: 3 people

package.json

@@ -79,6 +79,7 @@
   },
   "resolutions": {
     "**/@babel/parser": "7.24.7",
+    "**/@emotion/sheet": "npm:@elastic/emotion-sheet@1.4.1",
     "**/@hello-pangea/dnd": "18.0.1",
     "**/@langchain/core": "0.3.80",
     "**/@langchain/google-common": "0.2.18",

src/core/packages/chrome/browser-components/src/classic/__snapshots__/collapsible_nav.test.tsx.snap

@@ -23,6 +23,7 @@ import { createLazyPageObject } from './utils';
 import { Inspector } from './inspector';
 import { LensApp } from './lens_app';
 import { LoginPage } from './login_page';
+import { OverlaysPage } from './overlays';
 import type { KibanaUrl } from '../../common/services/kibana_url';
 
 export interface PageObjectsFixtures {
@@ -45,6 +46,7 @@ export interface PageObjects {
   inspector: Inspector;
   lens: LensApp;
   login: LoginPage;
+  overlays: OverlaysPage;
 }
 
 /**
@@ -67,6 +69,6 @@ export function createCorePageObjects(fixtures: PageObjectsFixtures): PageObject
     inspector: createLazyPageObject(Inspector, fixtures.page),
     lens: createLazyPageObject(LensApp, fixtures.page),
     login: createLazyPageObject(LoginPage, fixtures.page, fixtures.kbnUrl),
-    // Add new page objects here
+    overlays: createLazyPageObject(OverlaysPage, fixtures.page),
   };
 }

src/platform/packages/shared/kbn-scout/src/playwright/page_objects/index.ts

@@ -0,0 +1,43 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import type { ScoutPage } from '..';
+import { expect } from '..';
+
+export class OverlaysPage {
+  constructor(private readonly page: ScoutPage) {}
+
+  public get docViewerFlyout() {
+    return this.page.testSubj.locator('docViewerFlyout');
+  }
+
+  public get newsfeedButton() {
+    return this.page.testSubj.locator('newsfeed');
+  }
+
+  public get newsfeedFlyout() {
+    return this.page.testSubj.locator('NewsfeedFlyout');
+  }
+
+  public get newsfeedFlyoutCloseButton() {
+    return this.page.testSubj
+      .locator('NewsfeedFlyout')
+      .locator('[data-test-subj="euiFlyoutCloseButton"]');
+  }
+
+  public async openNewsfeedFlyout() {
+    await this.newsfeedButton.click();
+    await expect(this.newsfeedFlyout).toBeVisible();
+  }
+
+  public async closeNewsfeedFlyout() {
+    await this.newsfeedFlyoutCloseButton.click();
+    await expect(this.newsfeedFlyout).toBeHidden();
+  }
+}

src/platform/packages/shared/kbn-scout/src/playwright/page_objects/overlays.ts

@@ -0,0 +1,16 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+export const LOGSTASH = {
+  DEFAULT_START_TIME: 'Sep 19, 2015 @ 06:31:44.000',
+  DEFAULT_END_TIME: 'Sep 23, 2015 @ 18:31:44.000',
+  DATA_VIEW_NAME: 'logstash-*',
+  KBN_ARCHIVE:
+    'src/platform/plugins/shared/discover/test/scout/ui/fixtures/flyout_stability/kbn_archives/logstash_data_view.json',
+};

src/platform/plugins/shared/chart_expressions/expression_legacy_metric/public/components/__snapshots__/with_auto_scale.test.tsx.snap

@@ -0,0 +1,11 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+export { LOGSTASH } from './constants';
+export { setupFlyoutStability, teardownFlyoutStability } from './setup';

src/platform/plugins/shared/discover/test/scout/ui/fixtures/flyout_stability/constants.ts

@@ -0,0 +1,15 @@
+{
+  "attributes": {
+    "name": "logstash-*",
+    "timeFieldName": "@timestamp",
+    "title": "logstash-*"
+  },
+  "coreMigrationVersion": "8.8.0",
+  "created_at": "2025-01-01T00:00:00.000Z",
+  "id": "logstash-data-view",
+  "managed": false,
+  "references": [],
+  "type": "index-pattern",
+  "typeMigrationVersion": "7.11.0",
+  "updated_at": "2025-01-01T00:00:00.000Z"
+}

src/platform/plugins/shared/discover/test/scout/ui/fixtures/flyout_stability/index.ts

@@ -0,0 +1,27 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import type { ScoutParallelWorkerFixtures } from '@kbn/scout';
+import { LOGSTASH } from './constants';
+
+export async function setupFlyoutStability(scoutSpace: ScoutParallelWorkerFixtures['scoutSpace']) {
+  await scoutSpace.savedObjects.load(LOGSTASH.KBN_ARCHIVE);
+  await scoutSpace.uiSettings.setDefaultIndex(LOGSTASH.DATA_VIEW_NAME);
+  await scoutSpace.uiSettings.setDefaultTime({
+    from: LOGSTASH.DEFAULT_START_TIME,
+    to: LOGSTASH.DEFAULT_END_TIME,
+  });
+}
+
+export async function teardownFlyoutStability(
+  scoutSpace: ScoutParallelWorkerFixtures['scoutSpace']
+) {
+  await scoutSpace.uiSettings.unset('defaultIndex', 'timepicker:timeDefaults');
+  await scoutSpace.savedObjects.cleanStandardList();
+}

src/platform/plugins/shared/discover/test/scout/ui/fixtures/flyout_stability/kbn_archives/logstash_data_view.json

@@ -0,0 +1,69 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import { tags, spaceTest } from '@kbn/scout';
+import { expect } from '@kbn/scout/ui';
+import { setupFlyoutStability, teardownFlyoutStability } from '../../fixtures/flyout_stability';
+
+spaceTest.describe('Flyout system Emotion cache stability', { tag: tags.stateful.classic }, () => {
+  spaceTest.beforeAll(async ({ scoutSpace }) => {
+    await setupFlyoutStability(scoutSpace);
+  });
+
+  spaceTest.beforeEach(async ({ browserAuth, pageObjects }) => {
+    await browserAuth.loginAsViewer();
+    await pageObjects.discover.goto();
+  });
+
+  spaceTest.afterAll(async ({ scoutSpace }) => {
+    await teardownFlyoutStability(scoutSpace);
+  });
+
+  spaceTest(
+    'opening a flyout after a cascade close does not corrupt the Emotion style cache',
+    async ({ page, pageObjects }) => {
+      const consoleErrors: string[] = [];
+      page.on('console', (msg) => {
+        if (msg.type() === 'error') {
+          consoleErrors.push(msg.text());
+        }
+      });
+
+      await spaceTest.step('open a document flyout', async () => {
+        await pageObjects.discover.waitUntilSearchingHasFinished();
+        await pageObjects.discover.openDocumentDetails({ rowIndex: 0 });
+        await expect(pageObjects.overlays.docViewerFlyout).toBeVisible();
+      });
+
+      await spaceTest.step('open a second flyout from a different domain', async () => {
+        await pageObjects.overlays.openNewsfeedFlyout();
+      });
+
+      await spaceTest.step('close the second flyout, triggering a cascade close', async () => {
+        await pageObjects.overlays.closeNewsfeedFlyout();
+        await expect(pageObjects.overlays.docViewerFlyout).toBeHidden();
+      });
+
+      await spaceTest.step('open a new flyout after the cascade close', async () => {
+        await pageObjects.discover.openDocumentDetails({ rowIndex: 0 });
+        await expect(pageObjects.overlays.docViewerFlyout).toBeVisible();
+      });
+
+      await spaceTest.step(
+        'verify no insertBefore errors from stale Emotion cache refs',
+        async () => {
+          await expect(page.testSubj.locator('discoverDocumentsTable')).toBeVisible();
+
+          const hasInsertBeforeError = consoleErrors.some((msg) => msg.includes('insertBefore'));
+          expect(hasInsertBeforeError).toBe(false);
+        }
+      );
+    }
+  );
+});