Ger, values and events used by the UI, not exposed in the XML are often inaccessable to scripting. They can often change stuff without updating the XML values.
When working with the ColorPicker, I tried to capture the click event using every known OnBlah handler and never could extract or ovreride the script. Its quite possible visibility set by WindowOptions can't be tested or set via XML.
It for sure over-rides XML settings. Forgot about this recently and had some WC_XXXbuttons set to invisible in XML showing up in-game due to the Option settings.
If you haven't already, I suggest running a little test. Set Slot 0's OnHover="LocalTooltip='parent.WC_Titlebar.visibile'"
Login, then check the tooltip value of Slot 0 with various WindowOption settings. If its doesn't change when you change WindowOptions, you're never gonna get a proper IF test.
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