Allow to use entity form mode instead of configuring widget in views

Hello sergei_brill , I would like to test your patch but not sure how to reproduce it.

Can you be so kind and provide steps ?

1. You need 2 bundles of entity type. It can be 2 node types: article and page.
2. Configure form display for default form mode for each node type so, that it has different settings for the same field (for example, different widgets for Author).
3. Create new custom form mode for nodes at /admin/structure/display-modes/form.
4. Configure form display for the form mode from point 3 for each node type so, that it has different settings for the same field.
5. Create node entries of each node type.
6. Create a view listing nodes of all the types. The view must display fields from the point 2 and 4 (it can be the same field, actually) as editable.
7. In the settings of the editable field in view select default form mode and save view. The view with nodes has to have different widgets for different node types. The widgets has to correspond to default form display (see point 2).
8. In the settings of the editable field in view select form mode created in point 3 and save view. The view with nodes has to have different widgets for different node types. The widgets has to correspond to form display with this form mode (see point 4).