When the autocomplete popup has a scrollbar, the rightmost part
of the suggestions is hidden when using RTL locale.
XUL autocompletes (using the richlistbox) were always displaying the
suggestions using LTR. I couldn't find any CSS rule enforcing this, so
I assume this was a default behavior of the richlist box.
This patch restores the same behavior as before.
MozReview-Commit-ID: 9AcMxEe6tuL
--HG--
extra : rebase_source : 9329892b3d387739ffc9c53d3c89b3a30e8833ff
50a256422a