add new assist to change visibility of all struct fields

[bnjjj]

Adds visibility for each field inside public struct.
It doesn't affect fields with a visibility already set

[matklad]

Not sure it pulls its weight -- there's "change visibility" for a single field already, so you can just repeat that. And there are always multiple cursors to do this change manually...

[bnjjj]

I just wrote this because it was painful for me and after talking with other rustacean it seems I'm not the only one but yes you know... always hard to know if it could fit also for other people

[matklad]

We don't have a good procedure to decide if the additional benefit of assist when it is useful overweights the additional costs when it is not useful/maintanence cost. So, I am going to go with my gut feeling here, and the gut feeling says that this assist has a rather broad applicability range (any non-private sturts) while it's useful in only few select circumstances, and doesn't feel like an enabling buliding block for powerful combinations.

So, let's close this. We can always add this back if folks complain that they really want this.