Merge pull request #2530 from jonasschnelli/mac_win_reopen_fix

fixes #1522: GUI Disappearing (Mac OSX)

src/qt/bitcoingui.cpp

@@ -153,6 +153,7 @@ BitcoinGUI::~BitcoinGUI()
         trayIcon->hide();
 #ifdef Q_OS_MAC
     delete appMenuBar;
+    MacDockIconHandler::instance()->setMainWindow(NULL);
 #endif
 }
 
@@ -380,6 +381,7 @@ void BitcoinGUI::createTrayIconMenu()
 #else
     // Note: On Mac, the dock icon is used to provide the tray's functionality.
     MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
+    dockIconHandler->setMainWindow((QMainWindow *)this);
     trayIconMenu = dockIconHandler->dockMenu();
 #endif