Added option to open another private window from private window.

Closes #776
Closes #772

CHANGELOG

@@ -1,5 +1,6 @@
 Version 1.5.0
     * development version
+    * added option to open another private window from private window
     * added delete action in edit context menu on page
 
 Version 1.4.1

src/lib/app/mainapplication.cpp

@@ -927,7 +927,9 @@ void MainApplication::startPrivateBrowsing()
 {
     QStringList args;
     foreach (const QString &arg, arguments()) {
-        if (arg.startsWith(QLatin1Char('-'))) {
+        if (arg.startsWith(QLatin1Char('-')) &&
+                arg != QLatin1String("--private-browsing") &&
+                arg != QLatin1String("-pb")) {
             args.append(arg);
         }
     }

src/lib/app/qupzilla.cpp

@@ -549,9 +549,8 @@ void QupZilla::setupMenu()
     m_menuTools->addAction(QIcon(":/icons/menu/rss.png"), tr("RSS &Reader"), MENU_RECEIVER,  SLOT(showRSSManager()));
     m_menuTools->addAction(tr("Web In&spector"), MENU_RECEIVER, SLOT(showWebInspector()))->setShortcut(QKeySequence("Ctrl+Shift+I"));
     m_menuTools->addAction(QIcon::fromTheme("edit-clear"), tr("Clear Recent &History"), MENU_RECEIVER, SLOT(showClearPrivateData()))->setShortcut(QKeySequence("Ctrl+Shift+Del"));
-    m_actionPrivateBrowsing = new QAction(tr("&Private Browsing"), MENU_RECEIVER);
+    m_actionPrivateBrowsing = new QAction(mApp->isPrivateSession() ? tr("New &Private Browsing Window") : tr("&Private Browsing"), MENU_RECEIVER);
     m_actionPrivateBrowsing->setShortcut(QKeySequence("Ctrl+Shift+P"));
-    m_actionPrivateBrowsing->setVisible(!mApp->isPrivateSession());
     connect(m_actionPrivateBrowsing, SIGNAL(triggered(bool)), mApp, SLOT(startPrivateBrowsing()));
     m_menuTools->addAction(m_actionPrivateBrowsing);
     m_menuTools->addSeparator();