Spark DropDownList fix the popup size to the maxWidth of the RichText component renderer when right to left layout direction

Steps to reproduce:
1. Create a dropDownList skin whith popUpWidthMatchesAnchorWidth of the PopUpAnchor set to false, and popupPosition to below
2. ItemRenderer of the datagroup is a RichText with a maxWidth
3. Set the layoutDirection and direction to "rtl" (rightToLeft)
4. Provide a few data (exemple : 3) with short name to display
5. open the DropDownList

Actual Results:
The popup is displays from left to right but with the width set to maxWidth

Expected Results:
It should be display from right to left with the correct small width

Remarks : when it is from left to right it is working perfectly fine

Workaround (if any):