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Positron .Rmd files, chunks unable to run when extension enabled, but rmarkdown::render() works #10

@c-westhoven

Description

@c-westhoven

After enabling the extension R syntax on Positron, my .Rmd chunks "disappear" / are not able to run.
I have the quarto extension installed in order to run chunks in my .Rmd files (but not quarto itself installed)

With R-syntax extension enabled:
Extension Enabled

I get the error: Cannot execute code because there is no registered runtime for the 'rmd' language.

With R-syntax extension disabled:
Extension Disabled

I'm guessing R-syntax overrides the quarto chunk availability.

Ideally, I want to have the easy access to rmarkdownrender from R-syntax, and the possibility to run code chunks at the same time.

Positron Version: 2025.09.0 build 139
Code - OSS Version: 1.103.0
Commit: 30e3d0a74e09a0f6640929822cb57a326671360e
Date: 2025-08-29T18:31:36.739Z
Electron: 37.2.3
Chromium: 138.0.7204.100
Node.js: 22.17.0
V8: 13.8.500258-electron.0
OS: Darwin arm64 24.6.0

R version: 4.4.1

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