use about user_data of lv_group

How-to
1

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Description

In V7, there is only get function of user_data of lv_group, but not set function. In V8, there is neither get function nor set function of user_data of lv_group. So, whether user_data of lv_group is useful in LVGL?

What MCU/Processor/Board and compiler are you using?

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