[Feature request] ListData selection management convenience methods

[Faithfinder]

Provide a general summary of the feature here

I'd like equivalents of add and remove methods for selection.

😯 Current Behavior

Manual implementation like

let nextSelected = new Set(list.selectedKeys);
if (list.selectedKeys === "all") {
  nextSelected = new Set(initialItems.map((metric) => metric.id));
}
nextSelected.delete(metric.id);
list.setSelectedKeys(nextSelected);

[snowystinger]

Just checking, you mean for useListData?

That hook is really just to get people started, you are more than welcome to use your own hook to manage data. You could probably wrap our hook in your own to supply this functionality.

I'll still check if it's something we'd like to add.

[Faithfinder]

I've found it quite convenient to use it as is in scenarios where I need to do a lot to arrays of data.

Writing your own is always an option, but I bet this isn't much effort to expose. Without looking at source, you must already have these methods internally on the SelectionManager (or somewhere else, for integration with RAC ListBox and friends)

[snowystinger]

We discussed this today, and we'd like to add it, though we want to workshop the names of the functions a bit more.

Would you like to create a PR?

[Faithfinder]

Hmm, maybe. I don't have a lot of time for open source, but this doesn't look like a lot of work, maybe I can find a couple of hours somewhere =P

[CanRau]

I'd love to have props or methods like hasOrderChanged & hasListChanged 🤓
Or should I open a new issue for those?

[snowystinger]

New issue if you please. The ones in this issue are well defined already and should be ready for implementation. I don't want to confuse anyone with new ones that haven't been discussed yet.