%
% stack: new-cont row
%
% get the prior value for tracking a real change
%
3 @^Cell
sel@
_Grid.Cell \_

%
% stack: new-cont prev-cont
%
second exact$
{
%
% exactly the same, no reason to log a change
%
}
{
%
% stack: new-cont
%
% new data, signal a change in the tree values
%
 Tree.Changed
 dup 0x09 char " " replall
 _Grid.Vlen left
 *atvalues
 @!Cell

} ifelse

%
% stack: new-cont
%