tdf#134253 sw: fix SwUndoInserts::UndoImpl() if inserting before section

Somehow the clipboard is pasted before the SwSectionNode, which is the
first node in the body text.

The OSL_ENSURE( !bStartIsTextNode, "Oops, undo may be instable now." )
is triggered; the Undo must remove 2 SwTextNode in this case.

Because of the extra SwTextNode the indexes are off by 1 and this starts
to assert since commit 24fd14b387dca458a1b6e9415e936d26562ddb1e when
setting a fieldmark on a non-text node.

Change-Id: Ic52b0f4c7665994cadfe8f074bc4607c55352aa1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/97887
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@cib.de>

0 files changed, 0 insertions, 0 deletions