Fixes #2328

1) Fixed issue of opening Query Tool and Debugger in new Tab with QT 5.8 and annulen webkit
 2) Moved unload event of window from javascript files to html.
 3) Change alertify messages for debugger.
 4) Closed all connections created by debugger. Previously only one connection has been closed.

runtime/BrowserWindow.cpp

@@ -73,8 +73,18 @@ BrowserWindow::BrowserWindow(QString url)
     m_tabGridLayout = new QGridLayout(m_pgAdminMainTab);
     m_tabGridLayout->setContentsMargins(0, 0, 0, 0);
     m_mainWebView = new WebViewWindow(m_pgAdminMainTab);
+
 #ifdef PGADMIN4_USE_WEBENGINE
     m_mainWebView->setPage(new WebEnginePage());
+    m_mainWebView->page()->setNetworkAccessManager(m_netAccessMan);
+#else
+    m_cookieJar = new QNetworkCookieJar();
+    m_netAccessMan = new QNetworkAccessManager();
+    m_netAccessMan->setCookieJar(m_cookieJar);
+    m_mainWebView->setPage(new WebViewPage());
+    m_mainWebView->page()->setNetworkAccessManager(m_netAccessMan);
+    m_mainWebView->settings()->setAttribute(QWebSettings::JavascriptEnabled, true);
+    m_mainWebView->settings()->setAttribute(QWebSettings::JavascriptCanOpenWindows, true);
 #endif
 
 #ifdef PGADMIN4_DEBUG
@@ -107,6 +117,8 @@ BrowserWindow::BrowserWindow(QString url)
 #else
     // Register the slot when click on the URL link form main menu bar
     connect(m_mainWebView, SIGNAL(linkClicked(const QUrl &)),SLOT(urlLinkClicked(const QUrl &)));
+    // Register the slot when click on the URL link for QWebPage
+    connect(m_mainWebView->page(), SIGNAL(createTabWindowKit(QWebPage * &)),SLOT(createNewTabWindowKit(QWebPage * &)));
 #endif
 
     // Register the slot on tab index change
@@ -120,6 +132,7 @@ BrowserWindow::BrowserWindow(QString url)
     m_mainWebView->page()->setForwardUnsupportedContent(true);
     connect(m_mainWebView->page(), SIGNAL(downloadRequested(const QNetworkRequest &)), this, SLOT(download(const QNetworkRequest &)));
     connect(m_mainWebView->page(), SIGNAL(unsupportedContent(QNetworkReply*)), this, SLOT(unsupportedContent(QNetworkReply*)));
+    m_mainWebView->page()->setForwardUnsupportedContent(true);
     m_mainWebView->page()->setLinkDelegationPolicy(QWebPage::DelegateAllLinks);
 #endif
 
@@ -150,6 +163,13 @@ BrowserWindow::BrowserWindow(QString url)
     m_mainWebView->setUrl(m_appServerUrl);
 }
 
+// Destructor
+BrowserWindow::~BrowserWindow()
+{
+    if (m_tabWidget)
+        delete m_tabWidget;
+}
+
 // Save the window geometry on close
 void BrowserWindow::closeEvent(QCloseEvent *event)
 {
@@ -787,9 +807,9 @@ void BrowserWindow::closetabs()
 
     // If QTabWidget contains only one tab then hide the TabBar window
     if ((totalTabs - 1) < 2)
-	    m_tabWidget->tabBar()->setVisible(false);
+        m_tabWidget->tabBar()->setVisible(false);
     else
-	    m_tabWidget->tabBar()->setVisible(true);
+        m_tabWidget->tabBar()->setVisible(true);
 
     QObject *senderPtr = QObject::sender();
     if (senderPtr != NULL)
@@ -806,7 +826,24 @@ void BrowserWindow::closetabs()
 
         // free the allocated memory when the tab is closed
         if (tab != NULL)
+        {
+            QList<QWidget*> widgetList = tab->findChildren<QWidget*>();
+            foreach (QWidget* widgetPtr, widgetList)
+            {
+                if (widgetPtr != NULL)
+                {
+                    webviewPtr = dynamic_cast<WebViewWindow*>(widgetPtr);
+                    if (webviewPtr != NULL)
+                    {
+                        // Trigger the action for tab window close so unload event
+                        // will be called and resources will be freed properly.
+                        webviewPtr->page()->triggerAction(QWebPage::RequestClose);
+                    }
+                }
+            }
+
             delete tab;
+        }
 
         // Adjust the tab index value if the tab is closed in between
         for (loopCount = 1; loopCount < totalTabs; loopCount++)
@@ -905,6 +942,7 @@ void BrowserWindow::tabTitleChanged(const QString &str)
     }
 }
 
+
 void BrowserWindow::current_dir_path(const QString &dir)
 {
     m_dir = dir;
@@ -914,6 +952,72 @@ void BrowserWindow::current_dir_path(const QString &dir)
     settings.setValue("Browser/LastSaveLocation", m_last_open_folder_path);
 }
 
+#ifndef PGADMIN4_USE_WEBENGINE
+void BrowserWindow::createNewTabWindowKit(QWebPage * &p)
+{
+    m_addNewTab = new QWidget(m_tabWidget);
+    m_addNewGridLayout = new QGridLayout(m_addNewTab);
+    m_addNewGridLayout->setContentsMargins(0, 0, 0, 0);
+    m_addNewWebView = new WebViewWindow(m_addNewTab);
+    m_addNewWebView->setPage(new WebViewPage());
+    m_addNewWebView->setZoomFactor(m_mainWebView->zoomFactor());
+
+    m_addNewWebView->settings()->setAttribute(QWebSettings::JavascriptEnabled, true);
+    m_addNewWebView->settings()->setAttribute(QWebSettings::JavascriptCanOpenWindows, true);
+
+    m_widget = new QWidget(m_addNewTab);
+    m_toolBtnBack = new QToolButton(m_widget);
+    m_toolBtnBack->setFixedHeight(PGA_BTN_SIZE);
+    m_toolBtnBack->setFixedWidth(PGA_BTN_SIZE);
+    m_toolBtnBack->setIcon(QIcon(":/back.png"));
+    m_toolBtnBack->setToolTip(tr("Go back"));
+    m_toolBtnBack->setDisabled(true);
+
+    m_toolBtnForward = new QToolButton(m_widget);
+    m_toolBtnForward->setFixedHeight(PGA_BTN_SIZE);
+    m_toolBtnForward->setFixedWidth(PGA_BTN_SIZE);
+    m_toolBtnForward->setIcon(QIcon(":/forward.png"));
+    m_toolBtnForward->setToolTip(tr("Go forward"));
+    m_toolBtnForward->setDisabled(true);
+
+    QPushButton *m_btnClose = new QPushButton(m_widget);
+    m_btnClose->setFixedHeight(PGA_BTN_SIZE);
+    m_btnClose->setFixedWidth(PGA_BTN_SIZE);
+    m_btnClose->setIcon(QIcon(":/close.png"));
+    m_btnClose->setToolTip(tr("Close tab"));
+
+    m_horizontalLayout = new QHBoxLayout(m_widget);
+    m_horizontalLayout->setSizeConstraint(QLayout::SetMinAndMaxSize);
+    m_horizontalLayout->setSpacing(1);
+    m_horizontalLayout->addWidget(m_toolBtnBack);
+    m_horizontalLayout->addWidget(m_toolBtnForward);
+
+    // Register the slot on titleChange so set the tab text accordingly
+    connect(m_addNewWebView, SIGNAL(titleChanged(const QString &)), SLOT(tabTitleChanged(const QString &)));
+
+    // Register the slot on toolbutton to show the previous history of web
+    connect(m_toolBtnBack, SIGNAL(clicked()), this, SLOT(goBackPage()));
+
+    // Register the slot on toolbutton to show the next history of web
+    connect(m_toolBtnForward, SIGNAL(clicked()), this, SLOT(goForwardPage()));
+
+    // Register the slot on close button , added manually
+    connect(m_btnClose, SIGNAL(clicked()), SLOT(closetabs()));
+    m_addNewGridLayout->addWidget(m_addNewWebView, 0, 0, 1, 1);
+    m_tabWidget->addTab(m_addNewTab, QString());
+    m_tabWidget->tabBar()->setVisible(true);
+    m_tabWidget->setCurrentIndex((m_tabWidget->count() - 1));
+
+    // Set the back and forward button on tab
+    m_tabWidget->tabBar()->setTabButton((m_tabWidget->count() - 1), QTabBar::LeftSide, m_widget);
+    m_tabWidget->tabBar()->setTabButton((m_tabWidget->count() - 1), QTabBar::RightSide, m_btnClose);
+
+    m_addNewWebView->setTabIndex((m_tabWidget->count() - 1));
+    m_addNewWebView->page()->setNetworkAccessManager(m_netAccessMan);
+    p = m_addNewWebView->page();
+}
+#endif
+
 #ifdef PGADMIN4_USE_WEBENGINE
 // Below slot will be called when link is required to open in new tab.
 void BrowserWindow::createNewTabWindow(QWebEnginePage * &p)