... othervise the next drag event will insert the new range immediately
after the just inserted, resulting in invalid reference.

Regression after commit 42aece94

  don't replace content of formula field when selecting range, tdf#58635

Change-Id: I7dfdc1ce041ebadf4406dbb605676d87cd489efa
Reviewed-on: https://gerrit.libreoffice.org/64574Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>
(cherry picked from commit 6c5839d3)
Reviewed-on: https://gerrit.libreoffice.org/65026
Tested-by: Jenkins
Reviewed-by: Xisco Faulí <xiscofauli@libreoffice.org>