Two accessible document is created when "freeze" options is
enabled. meSplitPos identifies which accessible document handle
which part of the window. We should handle events only in that
accessible document which handles the active part.

Change-Id: Ic9674344951f620546dd272beaad796de611d258
Reviewed-on: https://gerrit.libreoffice.org/32065Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>