Fix undefined global variable usage in markCopySelection() inside CellCopyManager(). The function is using the "columns" global variable instead of getting the columns from the grid. Currently it works only because the example (e.g. example-spreadsheet.html) defines this global variable.
Fix undefined global variable usage in markCopySelection() inside CellCopyManager().
The function is using the "columns" global variable instead
of getting the columns from the grid. Currently it works only because
the example (e.g. example-spreadsheet.html) defines this global variable.

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