Different source code rendering in Quarto Source and Visual modes

[x1o]

Bug description

System details:

Positron and OS details:

Positron Version: 2025.06.0 (Universal) build 167
Code - OSS Version: 1.100.0
Commit: e7e5d5590adc6bf7b760f837051cd2f57ea9e3dc
Date: 2025-05-29T20:44:08.369Z (1 wk ago)
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin x64 24.5.0

Interpreter details:

R 4.4.2

Describe the issue:

The source code is rendered differently in source and visual modes.

Steps to reproduce the issue:

Source mode:

Visual mode:

Notice the different colours and how the ligatures aren't rendered in the visual mode.

Steps to reproduce

No response

Actual behavior

No response

Expected behavior

No response

Your environment

No response

[cderv]

duplicate of

• Different highlighting when using Source Code Editor vs Visual Editor. #630
• Incorrect syntax highlighting theme in VS Code when using Visual editor #637
• Quarto visual and source highlights are different (non-default themes; VS code apps) #525