fix hanging connections leading to crash in blocking netwotk request,…

… analogous to fixed ssl-error-request's hanging connections

src/core/network/qgsblockingnetworkrequest.cpp

@@ -213,13 +213,19 @@ QgsBlockingNetworkRequest::ErrorCode QgsBlockingNetworkRequest::doRequest( QgsBl
         // note that we don't need to handle waking this thread back up - that's done automatically by QgsNetworkAccessManager
       };
 
+      QMetaObject::Connection authRequestConnection;
+      QMetaObject::Connection proxyAuthenticationConnection;
+#ifndef QT_NO_SSL
+      QMetaObject::Connection sslErrorsConnection;
+#endif
+
       if ( requestMadeFromMainThread )
       {
-        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::authRequestOccurred, this, resumeMainThread, Qt::DirectConnection );
-        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::proxyAuthenticationRequired, this, resumeMainThread, Qt::DirectConnection );
+        authRequestConnection = connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::authRequestOccurred, this, resumeMainThread, Qt::DirectConnection );
+        proxyAuthenticationConnection = connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::proxyAuthenticationRequired, this, resumeMainThread, Qt::DirectConnection );
 
 #ifndef QT_NO_SSL
-        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::sslErrorsOccurred, this, resumeMainThread, Qt::DirectConnection );
+        sslErrorsConnection = connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::sslErrorsOccurred, this, resumeMainThread, Qt::DirectConnection );
 #endif
       }
       QEventLoop loop;
@@ -229,6 +235,13 @@ QgsBlockingNetworkRequest::ErrorCode QgsBlockingNetworkRequest::doRequest( QgsBl
       connect( qApp, &QCoreApplication::aboutToQuit, &loop, &QEventLoop::quit, Qt::DirectConnection );
       connect( this, &QgsBlockingNetworkRequest::finished, &loop, &QEventLoop::quit, Qt::DirectConnection );
       loop.exec();
+
+      // event loop exited - need to disconnect as to not leave functor hanging to receive signals in future
+      disconnect( authRequestConnection );
+      disconnect( proxyAuthenticationConnection );
+#ifndef QT_NO_SSL
+      disconnect( sslErrorsConnection );
+#endif
     }
 
     if ( requestMadeFromMainThread )