Leverage views grouping for entityreference selection widget

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This will need test coverage. When the tests are added the branch should be updated for 10.1 please

Reroll for 9.5.x (also appliable for 10.1.x)

No time to really evaluate more deeply, but a quick update that this doesn't seem to work as of Drupal 10.1.6.

matthijs → changed the visibility of the branch 3193844-leverage-views-grouping-11.x to hidden.

Created a MR for 11.x, which also works for 10.4

matthijs → changed the visibility of the branch 3193844-leverage-views-grouping-11.x to active.

matthijs → changed the visibility of the branch 3193844-leverage-views-grouping to hidden.

Moving to NW for the test coverage

This is an excellent and long overdue feature. Only thing I noticed is that in testing, the autocomplete widget seems to strip out the grouping. Any workaround?