e.g. formula prompt or fill series in Calc. The reason is that for
this particular vcl::Window, HasMirroredGraphics() != IsRTLEnabled().

Change-Id: Icd4bb2d22ba77d64c32b243d9c07745824e5e558
Reviewed-on: https://gerrit.libreoffice.org/55936
Tested-by: Jenkins
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>