(svn r10410) -Fix [FS458]: [OSX] if the resolution is changed to something that's too high for the monitor, then it's reduced to fit the monitor size (PinguTux)

This solves a possible crash
  This also solves a graphical glitch where the titlebar can be drawn on top of the game area
  Those issues only aplied to window mode

src/video/cocoa_v.mm

@@ -1184,10 +1184,17 @@ static const char* QZ_SetVideoWindowed(uint width, uint height)
 		/* We already have a window, just change its size */
 		if (!isCustom) {
 			[ _cocoa_video_data.window setContentSize:contentRect.size ];
+			// Ensure frame height - title bar height >= view height
+			contentRect.size.height = clamp(height, 0, [ _cocoa_video_data.window frame ].size.height - 22 /* 22 is the height of title bar of window*/);
+			height = contentRect.size.height;
 			[ _cocoa_video_data.qdview setFrameSize:contentRect.size ];
 		}
 	}
 
+	// Update again
+	_cocoa_video_data.width = width;
+	_cocoa_video_data.height = height;
+
 	[ _cocoa_video_data.window center ];
 
 	/* Only recreate the view if it doesn't already exist */