preview of slides do not scale properly on linux

[tosaba]

having marp-cli integrated into vscode is really great, I just noticed that in the latest version, the slides do not scale properly in the preview panel

Version: 1.31.1
Commit: 1b8e8302e405050205e69b59abb3559592bb9e60
Date: 2019-02-12T02:19:29.629Z
Electron: 3.1.2
Chrome: 66.0.3359.181
Node.js: 10.2.0
V8: 6.6.346.32
OS: Linux x64 4.15.0-45-generic

[yhatt]

I have never seen this scene in Windows and macOS. I'm going to start testing in Linux. Would you have a minimum Markdown to reproduce this?

I had battled against the scaling bug in last year. (marp-team/marpit#35, marp-team/marp-cli#15) VSCode uses the old Chromium 66, and it revives me an old headache. 😣

[tosaba]

Here is the minimum example. I also tested it with all my markdown related extensions being deactivated, but they don't interfere (except markdown all in one #9)

---
marp: true
---

# header

- bullet point contents
- bullet point contents
- bullet point contents

---

[yhatt]

I've tested provided Markdown in VSCode 1.31.1 and ubuntu 18.10, but it did not reproduce.

[yhatt]

The other probable case to interfere is custom CSS style. Would you have any CSS file defined in markdown.styles preference?

In addition, it's worth a try to run VSCode with --diable-gpu option.

[tosaba]

For me, it appears with default options and disabled extensions (v. 1.31.1 , ubuntu 18.04). I also didn't link any css stylesheets. I tested this on two separate computers with different graphics cards.

I also started vscode from the command line with --disable-gpu, but there is no difference.

[yhatt]

I had tried to reproduce again in ubuntu 18.04.1 LTS, but it works correctly.

We added help wanted tag. PR is welcome if anyone resolves this.

[yhatt]

My co-worker has reported a reproducible setting: "window.zoomLevel": 1.

@tosaba Could you confirm to show slide with correct scaling by resetting zoom level?

[tosaba]

Thanks. I confirm that this causes the issue in my case

[yhatt]

Done. An updated v0.1.0 has a workaround for zoom level. Previewed slide would have correct scales.