Comment:
Migration of unmigrated content due to installation of a new plugin
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Returns
An array of all the Group objects in the collection.
Remarks
Note that the array returned by ListGroups is a copy of the internal structure that ExcelWriter uses to manage Groups. As such, operations on individual Group objects in the array will take effect in the workbook, but operations on the array (e.g., removing Group objects or changing their order) will not have any effect.
