Removed use of cursor rectangles.

Poor use of cursor rectangles broke Lion full screen and led to rect
reset loop.  Cursor image is now updated only with the existing
enter/exit detection NSTrackingArea.

Fixes #339.
Fixes #375.

src/cocoa_window.m

@@ -64,30 +64,19 @@ static void centerCursor(_GLFWwindow *window)
     _glfwPlatformSetCursorPos(window, width / 2.0, height / 2.0);
 }
 
-// Get the cursor object that window uses in the specified cursor mode
+// Update the cursor to match the specified cursor mode
 //
-static NSCursor* getModeCursor(_GLFWwindow* window)
+static void updateModeCursor(_GLFWwindow* window)
 {
     if (window->cursorMode == GLFW_CURSOR_NORMAL)
     {
         if (window->cursor)
-            return (NSCursor*) window->cursor->ns.object;
+            [(NSCursor*) window->cursor->ns.object set];
         else
-            return [NSCursor arrowCursor];
+            [[NSCursor arrowCursor] set];
     }
     else
-        return (NSCursor*) _glfw.ns.cursor;
-}
-
-// Update the cursor to match the specified cursor mode
-//
-static void updateModeCursor(_GLFWwindow* window)
-{
-    // This is required for the cursor to update if it's inside the window
-    [getModeCursor(window) set];
-
-    // This is required for the cursor to update if it's outside the window
-    [window->ns.object invalidateCursorRectsForView:window->ns.view];
+        [(NSCursor*) _glfw.ns.cursor set];
 }
 
 // Enter fullscreen mode
@@ -476,10 +465,11 @@ static int translateKey(unsigned int key)
         [trackingArea release];
     }
 
-    NSTrackingAreaOptions options = NSTrackingMouseEnteredAndExited |
-                                    NSTrackingActiveInKeyWindow |
-                                    NSTrackingCursorUpdate |
-                                    NSTrackingInVisibleRect;
+    const NSTrackingAreaOptions options = NSTrackingMouseEnteredAndExited |
+                                          NSTrackingActiveInKeyWindow |
+                                          NSTrackingCursorUpdate |
+                                          NSTrackingInVisibleRect |
+                                          NSTrackingAssumeInside;
 
     trackingArea = [[NSTrackingArea alloc] initWithRect:[self bounds]
                                                 options:options
@@ -570,11 +560,6 @@ static int translateKey(unsigned int key)
         _glfwInputScroll(window, deltaX, deltaY);
 }
 
-- (void)resetCursorRects
-{
-    [self addCursorRect:[self bounds] cursor:getModeCursor(window)];
-}
-
 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
 {
     if ((NSDragOperationGeneric & [sender draggingSourceOperationMask])