FIX: shows a message as hovered when hovering actions (#21026)

When hovering the chat message actions we are technically not hovering the message anymore, which was removing the background and is slightly unexpected. This commit ensures we keep this background until closing the message actions.

plugins/chat/spec/system/chat_message_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+RSpec.describe "Chat message", type: :system, js: true do
+  fab!(:current_user) { Fabricate(:user) }
+  fab!(:channel_1) { Fabricate(:chat_channel) }
+  fab!(:message_1) { Fabricate(:chat_message, chat_channel: channel_1) }
+
+  let(:chat) { PageObjects::Pages::Chat.new }
+  let(:channel) { PageObjects::Pages::ChatChannel.new }
+
+  before { chat_system_bootstrap }
+
+  context "when hovering a message" do
+    before do
+      channel_1.add(current_user)
+      sign_in(current_user)
+    end
+
+    it "adds an active class" do
+      chat.visit_channel(channel_1)
+      channel.hover_message(message_1)
+
+      expect(page).to have_css("[data-id='#{message_1.id}'] .chat-message.is-active")
+    end
+  end
+end