Message Pinning: rework the message pinning list in the right panel (#12825)

* Fix pinning event loading after restart

* Update deps

* Replace pinned event list

* Add a dialog to confirm to unpin all messages

* Use `EmptyState` when there is no pinned messages

* Rework `PinnedEventTile` tests

* Add comments and refactor `PinnedMessageCard`

* Rework `PinnedMessageCard` tests

* Add tests for `UnpinAllDialog`

* Add e2e tests for pinned messages

* Replace 3px custom gap by 4px gap

* Use string interpolation for `Pin` action.

* Update playright sceenshot for empty state

test/components/views/dialogs/UnpinAllDialog-test.tsx

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2024 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import React from "react";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { EventType } from "matrix-js-sdk/src/matrix";
+
+import { UnpinAllDialog } from "../../../../src/components/views/dialogs/UnpinAllDialog";
+import { createTestClient } from "../../../test-utils";
+
+describe("<UnpinAllDialog />", () => {
+    const client = createTestClient();
+    const roomId = "!room:example.org";
+
+    function renderDialog(onFinished = jest.fn()) {
+        return render(<UnpinAllDialog matrixClient={client} roomId={roomId} onFinished={onFinished} />);
+    }
+
+    it("should render", () => {
+        const { asFragment } = renderDialog();
+        expect(asFragment()).toMatchSnapshot();
+    });
+
+    it("should remove all pinned events when clicked on Continue", async () => {
+        const onFinished = jest.fn();
+        renderDialog(onFinished);
+
+        await userEvent.click(screen.getByText("Continue"));
+        expect(client.sendStateEvent).toHaveBeenCalledWith(roomId, EventType.RoomPinnedEvents, { pinned: [] }, "");
+        expect(onFinished).toHaveBeenCalled();
+    });
+});

test/components/views/dialogs/__snapshots__/UnpinAllDialog-test.tsx.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<UnpinAllDialog /> should render 1`] = `
+<DocumentFragment>
+  <div
+    data-focus-guard="true"
+    style="width: 1px; height: 0px; padding: 0px; overflow: hidden; position: fixed; top: 1px; left: 1px;"
+    tabindex="0"
+  />
+  <div
+    aria-labelledby="mx_BaseDialog_title"
+    class="mx_UnpinAllDialog"
+    data-focus-lock-disabled="false"
+    role="dialog"
+  >
+    <div
+      class="mx_Dialog_header"
+    >
+      <h1
+        class="mx_Heading_h3 mx_Dialog_title mx_UnpinAllDialog_title"
+        id="mx_BaseDialog_title"
+      >
+        Unpin all messages?
+      </h1>
+    </div>
+    <span
+      class="_typography_yh5dq_162 _font-body-md-regular_yh5dq_59"
+    >
+      Make sure that you really want to remove all pinned messages. This action can’t be undone.
+    </span>
+    <div
+      class="mx_UnpinAllDialog_buttons"
+    >
+      <button
+        class="_button_zt6rp_17 _destructive_zt6rp_111"
+        data-kind="primary"
+        data-size="lg"
+        role="button"
+        tabindex="0"
+      >
+        Continue
+      </button>
+      <button
+        class="_button_zt6rp_17"
+        data-kind="tertiary"
+        data-size="lg"
+        role="button"
+        tabindex="0"
+      >
+        Cancel
+      </button>
+    </div>
+    <div
+      aria-label="Close dialog"
+      class="mx_AccessibleButton mx_Dialog_cancelButton"
+      role="button"
+      tabindex="0"
+    />
+  </div>
+  <div
+    data-focus-guard="true"
+    style="width: 1px; height: 0px; padding: 0px; overflow: hidden; position: fixed; top: 1px; left: 1px;"
+    tabindex="0"
+  />
+</DocumentFragment>
+`;