Index: /CKEditor/trunk/_source/plugins/dialogui/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialogui/plugin.js	(revision 3736)
+++ /CKEditor/trunk/_source/plugins/dialogui/plugin.js	(revision 3737)
@@ -217,4 +217,6 @@
 									keyPressedOnMe = true;
 							} );
+
+						// Lower the priority this 'keyup' since 'ok' will close the dialog.(#3749)
 						me.getInputElement().on( 'keyup', function( evt )
 							{
@@ -224,5 +226,5 @@
 									keyPressedOnMe = false;
 								}
-							} );
+							}, null, null, 1000 );
 					} );