nonzero extra inlines and "add another" create duplicate <tr> ids
|Reported by:||3point2||Owned by:||nobody|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
The first new row of an admin inline created by the "add another" button has the same id as the immediately preceding "extra" row.
This may have been a side effect of fixing #13175. Using forloop.counter0 in the inline templates when generating the extra inlines solves the problem.