When I press DELETE key in merged cells - cells unmerged.
In addition, another problem, when editing merged cells Editor shown only in first cell of merged cells (EditorLineMode=elmMultiLine)
procedure TsWorksheet.EraseCell(ACell: PCell; AKeepFormat: Boolean = false);
var
r, c: Cardinal;
begin
if ACell <> nil then begin
r := ACell^.Row;
c := ACell^.Col;
// Unmerge range if the cell is the base of a merged block
if IsMergeBase(ACell) then
UnmergeCells(r, c);