#2777 Groupbox default mold hflex min may have wrong size

[Jumper Chen]

for example, (the text "Div Content " cannot cover the text "Groupbox Content")

<zk>
<hlayout>
<groupbox hflex="min">
Groupbox Content
</groupbox>
<div>
Div Content
</div>
</hlayout>
</zk>

[Jumper Chen]

Fixed since 2011/07/13