on undo, as all affected formula-cells are preserved in original
form in the undo document. This is ensured by the drag-drop
move-block code (ScDocFunc::MoveBlock) which in-turn calls
ScDocument::UpdateReference, which records all original
formula-cells to the undo-document.

Anyway the sc::RefMovedHint object created in ScUndoDragDrop::Undo
is wrong, as it operates on original data-range(aCxt.maRange = aSrcRange)
which is interpreted as "old data-range" in the context of undo-move
operation.

Change-Id: Ic48cc3fa51fdb17e9338f65ac95b8e8d30c2c92c
Reviewed-on: https://gerrit.libreoffice.org/70315
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>