Trailing empty lines dropped from paste

[redmunds]

1. Copy Multiple lines where last line is empty
2. Paste

Results: last line is not pasted

According to git bisect this was introduced with "Update to final CodeMirror v4 (4.0.3)" commit (8696643).

[njx]

Looking at it, should be able to bisect in the commits since 4.0.3 to see where it was fixed. (It was probably fixed in a commit from the 3.0 stream, I'm guessing - will have to see how easy it is to monkeypatch.)

[njx]

Oh, that's odd - I can reproduce it in the latest master now. I could have sworn it worked when I just tried it. Anyway, I'll figure out where it broke and file a bug with Marijn.

[njx]

Ah, I figured out my confusion - it only reproduces when the line is truly blank (but not if it has spaces on it), which makes sense.

[njx]

Filed as codemirror/codemirror5#2452. It appears that the bug was caused (reintroduced) by codemirror/codemirror5@475b2be0, which removed a hack that fixed this bug (originally reported as codemirror/codemirror5#1474). That hack was removed because of the bug codemirror/codemirror5#2384 that we filed (about clicking the middle button on Linux adding a $). If this turns out to be complicated to fix, we could conceivably just reintroduce the hack in a monkeypatch, and live with that Linux bug for now, since it's probably lower priority.

[redmunds]

@njx I think middle click issue is a much lower priority than this one.

[njx]

Yup, agreed.

[RaymondLim]

And also it is Linux only issue.

[njx]

PR up in #7465