cursor position incorrect

[NanerLee]

• VSCode Version: 1.37.1
• OS Version: ubuntu lts 18.04.3

Steps to Reproduce:

Set "editor.renderWhitespace": "all" for watching easily

1. open a new file
2. press space key
   
3. press space key
   
4. press space key
   
5. press space key
   

we can find the cursor position is incorrect

More info:

1. I has three PCs, their are all ubuntu 18.04.3, but only one is normal.
2. The bug may be not about vscode version. I tried some old version , the bug is still.

Does this issue occur when all extensions are disabled?: Yes

[alexdima]

Workaround: "editor.disableMonospaceOptimizations": true

[NanerLee]

@alexandrudima it doesn't work. And vscode tell me it is a Unknown configuration setting

[Talden]

Can confirm the same bug on VS Code: 1.37.1 (from Microsofts repo) with Debian Stretch.

Sometimes the editor starts fine, sometimes not. But even successful starts can fail calculating metrics (maybe a font loading race).

[kaseiwang]

Workaround: "editor.disableMonospaceOptimizations": true

works on code(1.38.0-1) from archlinux/[community], thanks!

[Talden]

Workaround: "editor.disableMonospaceOptimizations": true

works on code(1.38.0-1) from archlinux/[community], thanks!

Is it expected that the setting is reported as "Unknown Configuration Setting"? This is the case for this version (which isn't impacted by the defect):

Version: 1.38.0 (user setup)
Commit: 3db7e09
Date: 2019-09-03T21:49:13.459Z
Electron: 4.2.10
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Windows_NT x64 10.0.18362

[alexdima]

Yes, currently this setting is for troubleshooting only, so it is normal for "editor.disableMonospaceOptimizations" to be unknown. In a perfect world the monospace optimizations should work and we wouldn't need this setting to turn it off. That's why I marked this as a bug as something is definitely no longer working...

[Rock718]

Change vscode default fonts maybe useful.See #80210

[NanerLee]

@Rock718 Thanks a lot, I change the default fonts to Noto Mono, it works!. And
editor.disableMonospaceOptimizations is not necessary