racket/gui cocoa: remove warp-pointer delay

Change suggested by Philipp Dikmann.

pkgs/gui-pkgs/gui-lib/mred/private/wx/cocoa/window.rkt

@@ -453,6 +453,7 @@
 
 (define _CGError _int32)
 (define-appserv CGWarpMouseCursorPosition (_fun _NSPoint -> _CGError))
+(define-appserv CGAssociateMouseAndMouseCursorPosition (_fun _BOOL -> _CGError))
 
 (define window%
   (class object%
@@ -895,7 +896,8 @@
       (define xb (box x))
       (define yb (box y))
       (client-to-screen xb yb)
-      (void (CGWarpMouseCursorPosition (make-NSPoint (unbox xb) (unbox yb)))))
+      (void (CGWarpMouseCursorPosition (make-NSPoint (unbox xb) (unbox yb))))
+      (void (CGAssociateMouseAndMouseCursorPosition #t)))
 
     (define/private (create-compose-window)
       (unless compose-cocoa

pkgs/gui-pkgs/gui-test/tests/gracket/item.rkt

@@ -2480,6 +2480,11 @@
 (make-object button%
 	     "Make Blue Editor" edp 
 	     (lambda (b e) (editor-frame null "blue")))
+(new horizontal-panel% [parent edp])
+(make-object button%
+	     "Warp Pointer" edp 
+	     (lambda (b e)
+               (send selector warp-pointer 5 5)))
 
 (define (choose-next radios)
   (let loop ([l radios])