As a user, I think that it is a very expected feature. When use a browser as an editor, I expect it to change the file when I save it. This approach feels very natural to me.
thats the problem. You should never be doing that. You should be using an editor, as an editor. The confusion is understandable though, as in general editors [1] aren't [2] widely [3] available [4] for [5] people to use.
Yeah, there's some really dumb practices out there. Some people even exclusively run their editor inside an EMULATOR of one of these devices: https://i.imgur.com/SBUxWMg.jpg - rather than using their actual operating system.