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Copy/Paste on groupBy output

Copy function does not work for me from the grid where I used the function groupBy() on my grid. Is that intentional? or is it suppose to work and am I making some mistake?

The usage of grouping and block selection in same time is not expected use-case. It doesn't supported in current version of dhtmlxGrid.  
You can try to use attached js file instead of original one - it solves main issue, but I'm not sure about support of other modes.