Regression from:
e68b6e34

AppendTextNode might be sufficient for import (when there is no
content in the document), but for clipboard operations better to
use the original SplitNode method.

Change-Id: I7de3e9bc9c5356acb0b4cc43927a0d39079522b2
Reviewed-on: https://gerrit.libreoffice.org/48124Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>
(cherry picked from commit 657da469)
Reviewed-on: https://gerrit.libreoffice.org/48206Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>