FIX: Don't modify `FloatKitInstance`s arrays unless needed (#27462)

app/assets/javascripts/float-kit/addon/services/menu.js

@@ -117,9 +117,11 @@ export default class Menu extends Service {
     await new Promise((resolve) => {
       menu.expanded = false;
 
-      this.registeredMenus = this.registeredMenus.filter(
+      if (this.registeredMenus.includes(menu)) {
-        (registeredMenu) => menu.id !== registeredMenu.id
+        this.registeredMenus = this.registeredMenus.filter(
-      );
+          (registeredMenu) => registeredMenu !== menu
+        );
+      }
 
       schedule("afterRender", () => {
         resolve();

app/assets/javascripts/float-kit/addon/services/tooltip.js

@@ -95,9 +95,11 @@ export default class Tooltip extends Service {
     tooltip.expanded = false;
 
     await new Promise((resolve) => {
-      this.registeredTooltips = this.registeredTooltips.filter(
+      if (this.registeredTooltips.includes(tooltip)) {
-        (registeredTooltips) => tooltip.id !== registeredTooltips.id
+        this.registeredTooltips = this.registeredTooltips.filter(
-      );
+          (registeredTooltip) => registeredTooltip !== tooltip
+        );
+      }
 
       schedule("afterRender", () => {
         resolve();

plugins/chat/test/javascripts/acceptance/chat-channel-reactions-test.js

@@ -0,0 +1,86 @@
+import { visit } from "@ember/test-helpers";
+import { test } from "qunit";
+import pretender, { response } from "discourse/tests/helpers/create-pretender";
+import {
+  acceptance,
+  publishToMessageBus,
+} from "discourse/tests/helpers/qunit-helpers";
+
+const category = { id: 1, color: "ff0000", name: "category1" };
+const messageId = 1891;
+const message = {
+  id: messageId,
+  message: "Lorem ipsum!",
+  cooked: `<p>Lorem ipsum!</p>`,
+  created_at: "2020-08-04T15:00:00.000Z",
+  user: {
+    id: 1,
+    username: "jesse",
+  },
+};
+
+acceptance("Discourse Chat - Channel Reactions", function (needs) {
+  needs.user({ has_chat_enabled: true });
+  needs.settings({ chat_enabled: true });
+
+  needs.hooks.beforeEach(function () {
+    pretender.get("/chat/api/me/channels", () =>
+      response({
+        direct_message_channels: [],
+        public_channels: [
+          {
+            id: 11,
+            title: "My channel",
+            chatable_id: 1,
+            chatable_type: "Category",
+            meta: { message_bus_last_ids: {} },
+            current_user_membership: {
+              following: true,
+              last_read_message_id: messageId,
+            },
+            chatable: category,
+          },
+        ],
+        meta: { message_bus_last_ids: {} },
+        tracking: {
+          channel_tracking: {
+            11: { unread_count: 0, mention_count: 0 },
+          },
+          thread_tracking: {},
+        },
+      })
+    );
+
+    pretender.get(`/chat/api/channels/11/messages`, () =>
+      response({
+        messages: [message],
+        meta: { can_delete_self: true },
+      })
+    );
+  });
+
+  test("shows the reaction button with the count", async function (assert) {
+    await visit("/chat/c/another-category/11");
+
+    await Promise.all([
+      publishToMessageBus("/chat/11", {
+        type: "reaction",
+        emoji: "rocket",
+        chat_message_id: messageId,
+        action: "add",
+        user: { id: 5, username: "alice" },
+      }),
+      publishToMessageBus("/chat/11", {
+        type: "reaction",
+        emoji: "rocket",
+        chat_message_id: messageId,
+        action: "add",
+        user: { id: 6, username: "bob" },
+      }),
+    ]);
+
+    assert
+      .dom(".chat-message-reaction[data-emoji-name='rocket'] .count")
+      .hasText("2");
+  });
+});