Fixes focus highlighting on disabled chosen select boxes (Chrome, Windows) #1994
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Clicking on a disabled chosen element focuses it and shows a highlight border around the element.
You can view an example here: http://jsfiddle.net/HpACF/
This is caused by tabindex -1 being added to the chosen-single anchor tag.
Any anchor tag without an href attribute cannot be tabbed to or focused into.
By adding tabindex -1 to the anchor tag, it means that it can not be focused into via tabbing.
My fix removes this tabindex -1 attribute from the anchor tag.
This means that a disabled chosen select box is no longer focusable when disabled, removing the highlight border when clicking into the chosen element.