Prevent logging into the same account twice

Check if an account is already logged in before allow the login process to continue.

BUG:459603

src/login.cpp

@@ -3,6 +3,12 @@
 
 #include "login.h"
 
+#ifdef QUOTIENT_07
+#include <accountregistry.h>
+#else
+#include "neochataccountregistry.h"
+#endif
+
 #include <connection.h>
 #include <qt_connection_util.h>
 
@@ -39,6 +45,12 @@ void Login::init()
             return;
         }
 
+        m_isLoggedIn = AccountRegistry::instance().isLoggedIn(m_matrixId);
+        Q_EMIT isLoggedInChanged();
+        if (m_isLoggedIn) {
+            return;
+        }
+
         m_testing = true;
         Q_EMIT testingChanged();
         if (!m_connection) {
@@ -181,3 +193,8 @@ bool Login::isLoggingIn() const
 {
     return m_isLoggingIn;
 }
+
+bool Login::isLoggedIn() const
+{
+    return m_isLoggedIn;
+}

src/login.h

@@ -23,6 +23,7 @@ class Login : public QObject
     Q_PROPERTY(bool supportsPassword READ supportsPassword NOTIFY loginFlowsChanged STORED false)
     Q_PROPERTY(QUrl ssoUrl READ ssoUrl NOTIFY ssoUrlChanged)
     Q_PROPERTY(bool isLoggingIn READ isLoggingIn NOTIFY isLoggingInChanged)
+    Q_PROPERTY(bool isLoggedIn READ isLoggedIn NOTIFY isLoggedInChanged)
 
 public:
     explicit Login(QObject *parent = nullptr);
@@ -49,6 +50,8 @@ public:
 
     bool isLoggingIn() const;
 
+    bool isLoggedIn() const;
+
     Q_INVOKABLE void login();
     Q_INVOKABLE void loginWithSso();
 
@@ -64,6 +67,7 @@ Q_SIGNALS:
     void errorOccured(QString message);
     void testingChanged();
     void isLoggingInChanged();
+    void isLoggedInChanged();
 
 private:
     void setHomeserverReachable(bool reachable);
@@ -78,4 +82,5 @@ private:
     QUrl m_ssoUrl;
     bool m_testing = false;
     bool m_isLoggingIn = false;
+    bool m_isLoggedIn = false;
 };

src/qml/Component/Login/Login.qml

@@ -49,7 +49,7 @@ LoginStep {
     }
 
     action: Kirigami.Action {
-        text: LoginHelper.testing && matrixIdField.acceptableInput ? i18n("Loading…") : i18nc("@action:button", "Continue")
+        text: LoginHelper.testing && matrixIdField.acceptableInput ? (LoginHelper.isLoggedIn ? i18n("Already logged in") : i18n("Loading…")) : i18nc("@action:button", "Continue")
         onTriggered: {
             if (LoginHelper.supportsSso && LoginHelper.supportsPassword) {
                 processed("qrc:/LoginMethod.qml");