[Fix] Fixed occasional fails to restore session.

- also removed unneeded (now) checks to process slot
  while app/window is closing
  * as now no signals will be invoked on deleted objects

src/app/mainapplication.cpp

@@ -683,7 +683,8 @@ static const int sessionVersion = 0x0002;
 
 bool MainApplication::saveStateSlot()
 {
-    if (m_websettings->testAttribute(QWebSettings::PrivateBrowsingEnabled) || m_isRestoring) {
+    if (m_websettings->testAttribute(QWebSettings::PrivateBrowsingEnabled) ||
+            m_isRestoring || m_mainWindows.count() == 0) {
         return false;
     }
 
@@ -697,6 +698,7 @@ bool MainApplication::saveStateSlot()
 
     stream << sessionVersion;
     stream << m_mainWindows.count();
+
     for (int i = 0; i < m_mainWindows.count(); i++) {
         QupZilla* qz = m_mainWindows.at(i).data();
         if (!qz) {

src/app/qupzilla.cpp

@@ -1479,7 +1479,14 @@ void QupZilla::closeEvent(QCloseEvent* event)
 
 #ifndef Q_WS_MAC
     if (mApp->windowCount() == 0) {
-        quitApp() ? event->accept() : event->ignore();
+        if (quitApp()) {
+            event->accept();
+            disconnectAllWidgets();
+        }
+        else {
+            event->ignore();
+        }
+
         return;
     }
 #endif
@@ -1537,7 +1544,7 @@ bool QupZilla::quitApp()
         }
     }
 
-    mApp->quitApplication();
+    QTimer::singleShot(0, mApp, SLOT(quitApplication()));
     return true;
 }
 

src/network/networkmanager.cpp

@@ -106,7 +106,7 @@ void NetworkManager::loadSettings()
 
 void NetworkManager::setSSLConfiguration(QNetworkReply* reply)
 {
-    if (!reply->sslConfiguration().isNull() && !mApp->isClosing()) {
+    if (!reply->sslConfiguration().isNull()) {
         QSslCertificate cert = reply->sslConfiguration().peerCertificate();
         if (!cert.isValid() || reply->property("downReply").toBool()) {
             return;

src/webview/webview.cpp

@@ -222,10 +222,6 @@ void WebView::loadFinished(bool state)
 {
     Q_UNUSED(state);
 
-    if (mApp->isClosing() || p_QupZilla->isClosing()) {
-        return;
-    }
-
     if (animationLoading(tabIndex(), false)->movie()) {
         animationLoading(tabIndex(), false)->movie()->stop();
     }
@@ -324,11 +320,6 @@ void WebView::titleChanged()
 
 void WebView::iconChanged()
 {
-    if (mApp->isClosing() || p_QupZilla->isClosing()) {
-        return;
-    }
-
-//    if (isCurrent())
     emit siteIconChanged();
 
     if (m_isLoading) {