The following patches made by Dmitry E. Oboukhov applied:

* Middle click on the tray icon translates current selection
  * Middle click on the main window also translates current selection
  * When editing groups, double click on the dictionary adds it to the
    current group.

src/groups.cc

@@ -36,6 +36,8 @@ Groups::Groups( QWidget * parent,
            this, SLOT( removeAll() ) );
   connect( ui.addDictsToGroup, SIGNAL( clicked() ),
            this, SLOT( addToGroup() ) );
+  connect( ui.dictionaries, SIGNAL(  doubleClicked(const QModelIndex &) ),
+           this, SLOT( addToGroup() ) );
   connect( ui.removeDictsFromGroup, SIGNAL( clicked() ),
            this, SLOT( removeFromGroup() ) );
 

src/mainwindow.cc

@@ -274,6 +274,22 @@ MainWindow::MainWindow( Config::Class & cfg_ ):
   doDeferredInit( dictionaries );
 }
 
+void MainWindow::mousePressEvent( QMouseEvent *event)
+{
+	if (event->button() != Qt::MidButton)
+		return QMainWindow::mousePressEvent(event);
+	// middle clicked
+  	QString subtype = "plain";
+
+  	QString str = QApplication::clipboard()->text(subtype, 
+  		QClipboard::Selection);
+	ui.translateLine->setText(str);
+      
+      	QKeyEvent ev(QEvent::Type(6)/*QEvent::KeyPress*/, Qt::Key_Enter,
+      		 Qt::NoModifier);
+      	QApplication::sendEvent(ui.translateLine, &ev);
+}
+
 MainWindow::~MainWindow()
 {
   // Save MainWindow state and geometry
@@ -1273,11 +1289,23 @@ void MainWindow::latestReleaseReplyReady()
 
 void MainWindow::trayIconActivated( QSystemTrayIcon::ActivationReason r )
 {
-  if ( r == QSystemTrayIcon::Trigger )
-  {
-    // Left click toggles the visibility of main window
-    toggleMainWindow();
-  }
+	switch(r) {
+		case QSystemTrayIcon::Trigger:
+			// Left click toggles the visibility of main window
+			toggleMainWindow();
+			break;
+
+		case QSystemTrayIcon::MiddleClick:
+			// Middle mouse click on Tray translates selection
+			// it is functional like as stardict
+			if ( scanPopup.get() ) {
+				scanPopup->translateWordFromSelection();
+			}
+			break;
+		default:
+			break;
+
+	}
 }
 
 void MainWindow::scanEnableToggled( bool on )

src/mainwindow.hh

@@ -108,6 +108,8 @@ private:
 
   void applyZoomFactor();
 
+  void mousePressEvent ( QMouseEvent * event );
+
 private slots:
 
   void hotKeyActivated( int );

src/scanpopup.cc

@@ -141,12 +141,21 @@ void ScanPopup::applyZoomFactor()
 
 void ScanPopup::translateWordFromClipboard()
 {
-  printf( "translating from clipboard\n" );
+	return translateWordFromClipboard(QClipboard::Clipboard);
+}
+
+void ScanPopup::translateWordFromSelection()
+{
+	return translateWordFromClipboard(QClipboard::Selection);
+}
+
+void ScanPopup::translateWordFromClipboard(QClipboard::Mode m)
+{
+  printf( "translating from clipboard or selection\n" );
 
   QString subtype = "plain";
 
-  QString str = QApplication::clipboard()->text( subtype,
-                                                 QClipboard::Clipboard );
+  QString str = QApplication::clipboard()->text( subtype, m);
 
   str = pendingInputWord = gd::toQString( Folding::trimWhitespaceOrPunct( gd::toWString( str ) ) );
 

src/scanpopup.hh

@@ -43,9 +43,14 @@ public slots:
 
   /// Translates the word from the clipboard, showing the window etc.
   void translateWordFromClipboard();
+  /// Translates the word from the clipboard selection
+  void translateWordFromSelection();
 
 private:
 
+  // Translates the word from the clipboard or the clipboard selection
+  void translateWordFromClipboard(QClipboard::Mode m);
+
   Config::Class & cfg;
   bool isScanningEnabled;
   std::vector< sptr< Dictionary::Class > > const & allDictionaries;