+ if (nr_screens == 1)
+ return [super constrainFrameRect:frameRect toScreen:screen];
+
+#ifdef NS_IMPL_COCOA
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
+ // If separate spaces is on, it is like each screen is independent. There is
+ // no spanning of frames across screens.
+ if ([NSScreen screensHaveSeparateSpaces])
+ return [super constrainFrameRect:frameRect toScreen:screen];
+#endif
+#endif
+
+ for (i = 0; i < nr_screens; ++i)
+ {
+ NSScreen *s = [screens objectAtIndex: i];
+ NSRect scrrect = [s frame];
+ NSRect intersect = NSIntersectionRect (frameRect, scrrect);
+
+ if (intersect.size.width > 0 || intersect.size.height > 0)
+ ++nr_eff_screens;
+ }
+
+ if (nr_eff_screens == 1)
+ return [super constrainFrameRect:frameRect toScreen:screen];
+