I don't think this is quite the issue reported. The problem was not whole-line cut/copy as a feature, but that it copy/pastes a totally blank line when used on a blank line. The desired fix was for it to not activate at all on blank lines. The issue, as I already detailed, is the "\n" CodeMirror always adds to the end of the copied line. With those removed (more like added only under proper circumstances), using whole-line cut/copy on a blank line works as desired (and also as I said, remedies a number described in #9130).

EDIT: I could be reading this all wrong and this PR does exactly what needs to be done instead of completely disabling the feature (as I initially thought). Apologies if that is the case. :\

This actually is what you think it is.
The pref, when disabled, disables the whole copy-line-where-cursor-is-on feature.

Even though this may not be the exact solution to the referenced issue, I guess it is a step in the right direction either way.

This options seems useful to me. I like this.
/cc @swmitra @nethip

Good idea for me!

That would really help me, I often accidentally blind type Ctrl-C instead of Ctrl-V

LGTM, but the description is not correct: is not only about empty lines.

Argh, now it's back to almost exactly the wording the CM manual uses.

Thank you, LGTM.

Thank you for reviewing!