GuiCtrlSetData() not appending a single value if it already exists

[Bowmore]

This script demonstrates a bug in repeated calls
to GUICtrlSetData() to add a single value to a list
where that value already exists in the list. The value
is not appended to the list unless there is a pipe character
after the value.

#include <GUIConstants.au3>

GUICreate("My GUI")  ; will create a dialog box that when displayed is centered

$mylist1 = GUICtrlCreatelist ("", 10,10)
GUICtrlSetData($mylist1, "test")
GUICtrlSetData($mylist1, "test")
; only one entry apeers in list

$mylist2 = GUICtrlCreatelist ("", 10,200)
GUICtrlSetData($mylist2, "test")
GUICtrlSetData($mylist2, "test|")
; two entries apeer in list

GUISetState ()       ; will display an empty dialog box with a  control with focus on

; Run the GUI until the dialog is closed
While 1
    $msg = GUIGetMsg()
    
    If $msg = $GUI_EVENT_CLOSE Then ExitLoop
Wend

[Jpm]

No bug the say
If the "data" starts with GUIDataSeparatorChar or is an empty string "" the previous list is destroyed.