+popup-adjust-margins-h appears to apply margin changes to the window you return to after closing a popup

### What did you expect to happen?

I've been trying out a new matrix client lately, called ement.el. Ement by default uses margins to display usernames on the left and timestamps on the right.

When I close popups, I expect it to leave my other buffers/windows alone.

### What actually happened?

When I have a popup open (usually the result of C-h f or C-h v), and I close it, returning to an Ement buffer, the margins of the Ement window will be set to 0.

### Describe your attempts to resolve the issue

Setting +popup-margin-width to nil resolves the issue by effectively disabling +popup-adjust-margins-h. I suppose another fix would be disabling ui/popups entirely.

### Steps to reproduce

- Install https://github.com/alphapapa/ement.el via its instructions (I also have a local module I've been building with the notion that once dev slows down a bit I could contribute it)
- Connect to a Matrix server
- Open a room
- Open a popup of some kind
- Close the popup

### System Information

https://pastebin.com/Dv8XVYMi