Fix display-line-numbers to show line number also for the last empty line!

[xparq]

Is is not shown only in the "visual" (or whatever) style I'm using? Or is it broken in general.

Without that it gives the strong impression that there isn't actually a line there, even though the cursor is moved down there.
(The general arcane clunkiness of Emacs allowed me to suspect that, assuming first that it's not a line number display problem; I even looked for ways to tell Emacs to stop it... -- before I realized that Emacs is doing the right thing here.)

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Not so sure any more... It's a dilemma of how to define a line:

a) one that has a line terminator, or the chars between the last one and EOF
b) one, where you can go to (vertically), regardless of being empty

I prefer (b), but both have merit. Practically though, there's a big benefit to the default behavior, which uses (a):
You can immediately tell the difference between an empty last line and one that only has some (invisible) whitespace!