Add ability to hide images after clicking "show image" (#29467)

* start hide

* Move useSettingsValueWithSetter to useSettings

* Add new setting showMediaEventIds

* Add a migration path

* Add an action button to hide settings.

* Tweaks to MImageBody to support new setting.

* Fixup and add tests

* add description for migration

* docs fixes

* add type

* i18n

* appese prettier

* Add tests for HideActionButton

* lint

* lint

* Use a hook for media visibility.

* Drop setting hook usage.

* Fixup MImageBody test

* Fixup tests

* Support functional components for message body rendering.

* Add a comment

* Move props into IProps

playwright/e2e/timeline/timeline.spec.ts

@@ -1,5 +1,5 @@
 /*
-Copyright 2024 New Vector Ltd.
+Copyright 2024, 2025 New Vector Ltd.
 Copyright 2022, 2023 The Matrix.org Foundation C.I.C.
 
 SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
@@ -905,6 +905,19 @@ test.describe("Timeline", () => {
                 mask: [page.locator(".mx_MessageTimestamp")],
             });
         });
+
+        test("should be able to hide an image", { tag: "@screenshot" }, async ({ page, app, room, context }) => {
+            await app.viewRoomById(room.roomId);
+            await sendImage(app.client, room.roomId, NEW_AVATAR);
+            await app.timeline.scrollToBottom();
+            const imgTile = page.locator(".mx_MImageBody").first();
+            await expect(imgTile).toBeVisible();
+            await imgTile.hover();
+            await page.getByRole("button", { name: "Hide" }).click();
+
+            // Check that the image is now hidden.
+            await expect(page.getByRole("link", { name: "Show image" })).toBeVisible();
+        });
     });
 
     test.describe("message sending", { tag: ["@no-firefox", "@no-webkit"] }, () => {