This ridiculous behaviour drives me @#$$%^&* insane. It is literally the only software I have ever seen or used that doesn’t release focus on enter/return.
Every single day I end up accidentally renaming a component and/or layer with a single letter shortcut (most often “m”). The fact that the SU dev team has let this idiosyncratic and UI-hostile behaviour stand for so many years is completely baffling to me. (just as their ridiculous logic for file save locations that scatters files all over my file system, rather than always saving — as the default — back to the originating folder).
If there was a overwhelmingly compelling reason/benefit to thwarting previous UI conventions, then maybe I could understand it. But I can’t think of a single instance where the SU programmed behaviour is more desirable than the universally-accepted UI practice.
/End rant.
Back on topic, good to learn the trick of entering a space to clear an accidental / unwanted overwrite of an instance name.