When saving an entity, I expect to see a status message and be redirected to the list/collection page.

Seems to work fine.

The patch works, but I would further discuss the functionality.

If I would be editing context, I'm not sure that I want to be redirected back to the context list by default.

What I suggest is to add two separate submit actions, with 'Save and continue' and 'Save and exit' labels. The button should look like a "dropbutton", the one Drupal 8 is using on creating node (Save and publish, Save as unpublished).

I made changes based on the previous patch. Now we have 2 submit buttons grouped together in one "drop-down button", one is named "Save and exit", which saves entity and redirect to the collection route. Another one is named "Save and continue", which just saves the entity.

I just removed weight for save buttons and changed "Save and Continue" to "Save and continue".

Nice patch. I think that #6 patch solution is better than #2. It would be nice if on save we show a message to a user that a context was saved. So basically just merge #6 and #2 patch.

Merged #6 and #2 together so now it also displays status message

Fixed patch because I edited patch instead of code (removed comment)

It looks good now. Thank you all for the contribution.