In grid grouping feature groupHeaderTpl does no longer show any column-rendered value
In 4.2, when grouping a grid there is no way to access in groupHeaderTpl a column-rendered form of groupValue.
Up to 4.1, the 'name' property was available (although indicated in the docs as an alias for groupRenderedValue, which never existed) which provided the column-rendered form of groupValue.
In 4.2, looking at the source (which apparently was heavily refactored), name is set to the same value of groupValue, as it is calculated using grouper.getGroupString which in turn just extract the record field. So, no longer any use of preppedRecords, like in 4.1
This is blocking, as I don't see any way of circumventing the issue.