Add "Check all" functionality

anybody → changed the visibility of the branch 3322484-allow-label-override to hidden.

I finally also created a core feature request for that, thinking it would make sense to have this in core: ✨ Add a sortable checkboxes widget (tableselect) as OptionsButtonsWidget alternative Active

It seems a great idea!

Could you please mention the module in the core issue, so other people with similar needs could reach the module while the core discussion is happening?

I'm afraid that having this new widget in core might take some time.

Thank you very very much for your immediate and positive feedback @plopesc!

I tried implementing this, but now I'm blocked by: 🐛 tableselect is incompatible with #tabledrag Active

Should you have any idea or see a mistake I made, please let me know. To me it looks like we need to postpone this now -.-
The only alternative would be to build a custom tableselect replacement, but I don't think that's a nice option.