Matthew Hilton c5b6ab5ddc MDL-76270 group: Refactor group action handling
Previously group bulk actions were handled by prepending
_act in the value of the input, and then using a custom function that
accessed $_GET and $_POST to determine which was pressed.

This was refactored in favor of the more standard method of using
optional_param.
2023-04-20 12:20:32 +10:00
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