Joystick: give duplicate joystick names distinct keys

src/Joystick/JoystickSDL.cc

@@ -36,7 +36,6 @@ QMap<QString, Joystick*> JoystickSDL::discover(MultiVehicleManager* _multiVehicl
     for (int i=0; i<SDL_NumJoysticks(); i++) {
         QString name = SDL_JoystickNameForIndex(i);
 
-        // TODO use GUID instead of name in case of two joysticks with same name
         if (!ret.contains(name)) {
             int axisCount, buttonCount, hatCount;
             bool isGameController;
@@ -65,6 +64,17 @@ QMap<QString, Joystick*> JoystickSDL::discover(MultiVehicleManager* _multiVehicl
             }
 
             qCDebug(JoystickLog) << "\t" << name << "axes:" << axisCount << "buttons:" << buttonCount << "hats:" << hatCount << "isGC:" << isGameController;
+
+            // Check for joysticks with duplicate names and differentiate the keys when neccessary.
+            // This is required when using an Xbox 360 wireless receiver that always identifies as
+            // 4 individual joysticks, regardless of how many joysticks are actually connected to the
+            // receiver. Using GUID does not help, all of these devices present the same GUID.
+            QString originalName = name;
+            uint8_t duplicateIdx = 1;
+            while (newRet[name]) {
+                name = QString("%1 %2").arg(originalName).arg(duplicateIdx++);
+            }
+
             newRet[name] = new JoystickSDL(name, qMax(0,axisCount), qMax(0,buttonCount), qMax(0,hatCount), i, isGameController, _multiVehicleManager);
         } else {
             newRet[name] = ret[name];