Fix a29766d: Wrong scrolling dropdown list position with RTL. #12412
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Motivation / Problem
Wrong position of drop down list with scrollbar when language is RTL:
Description
Take account of (possible) scrollbar width when positioning the drop down list with RTL.
(LTR is not affected as the list is always aligned to the left of the parent widget.)
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.