tab_menu cancels content visibility

[l0rb]

Anything inside a tab group with visible="false" is turned visible. Example:

<tab_menu>
  <tab name="tab1" label="tab1" />
  <group name="tab1">
    <text text="this is visible and thats ok" />
    <text text="this is visible but shouldnt" visible="false"/>
  </group>
</tab_menu>