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Dragging the selection's border onto cells that hold data replaced them
without asking, so dragging column B onto column A silently destroyed A.
Excel asks "There's already data here. Do you want to replace it?" first
(its "Alert before overwriting cells" option, on by default).
The drop now runs a new `range.move {range?, to, overwrite?}` command:
a cut and paste that returns a confirm question when the destination
holds data other than the moved cells; the grid shows it with OK and
Cancel, and OK runs it again with `overwrite: true`. A refused move
leaves the sheet and the clipboard as they were.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>