[EuiFilterGroup] Multi-select example not functional

[j-m]

... or at least as how I expected it to

Clicking on an EuiFilterSelectItem does not change it's checked state.

Issue #3735 makes it sounds like we are supposed to use EuiFilterGroup in conjunction with something else like EuiSelectable, but I can't find any examples of this. Have I missed something?

Also, this sentence is repeated

Add the prop withNext to remove the border between it and the next EuiFilterButton to visually group similar or opposite style filters.

[thompsongl]

Hey @j-m, thanks for reporting this.
The component(s) do work, but the documentation "Multi-select" example appears to be incomplete. EuiFilterSelectItem requires an onClick handler to change its checked state and update the items list.

[thompsongl]

The onClick/checked state problems have been resolved, but there are some extra parts of functionality that could still be added to the example. See comments in #4178