With all the due respect, but such an editor doesn't deserve to be used in my opinion...
I highly recommend Notepad++
With all due respect you don't know what you're talking about
The editor I used to add the missing space at the end of that line is Notepad++. The editor I work with has a few functionalities a lot better than Notepad++. Apart from that personal opinion, I've been using it for 10 years a lot (for a few years 8+ hours a day every day) and work a lot faster with it than with Notepad++.
(or at least it should allow to disable such an option).
I can disable that option, but not on a per file basis and on a per project basis there are some troubles with the configuration (I've already submitted a bug report on this). Hmm, now that you mention it, there IS a way to do it, by putting the configuration inside the project. Thanks for reminding me of it

None of this matters much IMHO. I posted mainly because it's bad requiring spaces at the end of lines. It's too easy for the spaces to disappear/go missing/... and it's very hard for the programmer/translator to notice that those same spaces are missing.
Edit: I see that Steven added the missing space if it's missing. Thank you very much.