change `text-field%' to treat numpad Enter like normal Enter/Return

Closes PR 7890

original commit: 3ff7ca2d317396d3747b3c6dab35c5e29aac95ea

collects/mred/private/wxtextfield.rkt

@@ -90,7 +90,9 @@
 	 (entry-point
 	  (lambda (e)
 	    (let ([c (send e get-key-code)])
-	      (unless (and (or (eq? c #\return) (eq? c #\newline))
+	      (unless (and (or (eq? c #\return) 
+                               (eq? c #\newline)
+                               (eq? c #\u3)) ; numpad enter
 			   return-cb
 			   (return-cb (lambda () (callback 'text-field-enter) #t)))
 		(as-exit (lambda () (super-on-char e)))))))]

collects/scribblings/gui/text-field-class.scrbl

@@ -10,7 +10,7 @@ A @scheme[text-field%] object is an editable text field with an
 @itemize[
 
  @item{A single line of text is visible, and a special control event
- is generated when the user presses Enter (when the text field has the
+ is generated when the user presses Return or Enter (when the text field has the
  focus) and the event is not handled by the text field's frame or
  dialog (see @xmethod[top-level-window<%> on-traverse-char] ).}