Groups content form available tags

As I said the workaround that I am testing is to use a new entity reference view, I cannot use the provided view as it's base table is group relationship rather than taxonomy term so it cannot be used as an entity reference eligible view.
I am attaching the view, maybe it could be included in module, as it's as generic as it could be. Maybe later I could write some browser tests to assert it works as it should.

As I used this view as origin of available tags, I found that entityreference view could not set dynamically the argument.
here it works setting the argument with an alter hook to finally provide :

...
 $form['field_tags']['widget'][0]['target_id']['#selection_settings']['view']['arguments'][0] = $groups[0]->id();
...