Fixed X-axis scroll offset inversion (take two).

Fixed #239 (properly).

src/cocoa_window.m

@@ -687,7 +687,7 @@ static int translateKey(unsigned int key)
         // NOTE: The X-axis is inverted for consistency with Windows and X11.
         //       Natural scrolling inverts both axes, making it consistent with
         //       the similarly named feature on modern X11 desktop systems.
-        _glfwInputScroll(window, -deltaX, deltaY);
+        _glfwInputScroll(window, deltaX, deltaY);
     }
 }
 

src/win32_window.c

@@ -728,7 +728,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
         case WM_MOUSEHWHEEL:
         {
             // This message is only sent on Windows Vista and later
-            _glfwInputScroll(window, (SHORT) HIWORD(wParam) / (double) WHEEL_DELTA, 0.0);
+            _glfwInputScroll(window, -((SHORT) HIWORD(wParam) / (double) WHEEL_DELTA), 0.0);
             return 0;
         }
 

src/x11_window.c

@@ -949,9 +949,9 @@ static void processEvent(XEvent *event)
             else if (event->xbutton.button == Button5)
                 _glfwInputScroll(window, 0.0, -1.0);
             else if (event->xbutton.button == Button6)
-                _glfwInputScroll(window, -1.0, 0.0);
-            else if (event->xbutton.button == Button7)
                 _glfwInputScroll(window, 1.0, 0.0);
+            else if (event->xbutton.button == Button7)
+                _glfwInputScroll(window, -1.0, 0.0);
 
             else
             {