Fixed crash when resizing a window to a zero-height/width size (#984)

src/SFML/Window/OSX/SFOpenGLView.mm

@@ -170,6 +170,17 @@ BOOL isValidTextUnicode(NSEvent* event);
 }
 
 
+////////////////////////////////////////////////////////
+-(void)update
+{
+    // In order to prevent an infinite recursion when the window/view is
+    // resized to zero-height/width, we ignore update event when resizing.
+    if (![self inLiveResize]) {
+        [super update];
+    }
+}
+
+
 ////////////////////////////////////////////////////////
 -(void)finishInit
 {