Word Wrap is imprecise with non-monospace fonts

[jmcooper]

I'm seeing a wide right margin in my editor when I have word wrap on.

I don't see this on other computers. Not sure what's up. This is all I have in my user settings:
// Place your settings in this file to overwrite the default settings
{
"editor.tabSize": 2,
"editor.insertSpaces": true,
"editor.fontSize": 21,
"editor.fontFamily": "Source Code Pro",
"git.enabled": false
}

• VSCode Version: Code 1.5.2 (66f37fd, 2016-09-12T13:30:03.456Z)
• OS Version: Windows_NT ia32 10.0.10586

Steps to Reproduce:

1. Turn on Word Wrap (alt-z)

[alexdima]

@jmcooper Try changing the setting: editor.wrappingIndent: "none". It is "same" by default

[jmcooper]

@alexandrudima Thanks, but that affects the behavior of the left indent. I've tried changing that and it doesn't help.

[jmcooper]

@chrmarti Is there some info you need that I can get you?

[chrmarti]

@jmcooper To clarify: You are referring to the spacing left of the line numbers, right?

[jmcooper]

No, I'm referring to all the white space on right side, after the code. It
is like the code is wrapping way too soon.

[chrmarti]

We only wrap on whitespace it seems.

[jmcooper]

That's not the problem, I already tested that by adding some whitespace and
it still wrapped way early.

[jmcooper]

@chrmarti Notice in this screenshot how line 22 is wrapping. There is plenty of space for the }); and yet it wrapped because of some invisible, wide margin on the right. If I make my window wider it will unwrap, so it does appear to be a wrapping problem.

[alexdima]

@jmcooper Thank you for the clarifications. Now I understand what you mean.

Word wrapping cut points are computed on our side based on two characters widths, namely the width of n for half-width characters and the width of ｍ for CJK full-width characters.

Given your text doesn't contain CJK full-width characters, only the width of n is used. So each character counts as the width of n, including i or j which are quite thin.

TL;DR The computation of wrapping cut points is imprecise for non-monospaced fonts.

[jmcooper]

Ahh, this makes sense. I didn't realize the font I was trying to use wasn't installed, so I was getting a non-monospaced font.

[alexdima]

Let's track in #2654