fix: don't use same websocket connection for multiple accounts (#6348)

src/providers/twitch/TwitchAccountManager.hpp

@@ -55,7 +55,15 @@ public:
 
     pajlada::Settings::Setting<QString> currentUsername{"/accounts/current",
                                                         ""};
-    // pajlada::Signals::NoArgSignal currentUserChanged;
+
+    /// This signal fires after we've figured out what the new account is, but before
+    /// any updates to Helix have been made.
+    ///
+    /// Useful for scenarios where you have to call Helix using the previous account.
+    pajlada::Signals::Signal<std::shared_ptr<TwitchAccount>,
+                             std::shared_ptr<TwitchAccount>>
+        currentUserAboutToChange;
+
     boost::signals2::signal<void()> currentUserChanged;
     pajlada::Signals::NoArgSignal userListUpdated;