How do I stop code cells with line highlighting from copying multiple times?

[marcdotson]

Description

When I use code highlighting in code cells for revealjs presentations, the copied code is duplicated as many times as I have stepped through the code with line highlighting. How do I stop code cells with line highlighting from copying multiple times?

Here's an illustration of when the duplicate code copy happens as a function of code line highlighting:

---
title: "Duplicate Code Copy"
format: 
  revealjs:
    code-copy: true       # Show copy button on code blocks
    self-contained: true  # Render to a single HTML file
execute:
  eval: false
  echo: true
jupyter: python3
---

Duplicate code copy

```{python}
#| code-line-numbers: "|1-2|4-6|8-10"

import numpy as np
import polars as pl

# Set randomization seed and n
rng = np.random.default_rng(42)
n = 10_000_000

# Discrete uniform distribution
disc_unif = np.random.randint(1, 7, size=n)
draws = pl.DataFrame(disc_unif, schema=['disc_unif'])
```

And when it does not duplicate code copy due to the absence of code line highlighting:

```{python}
import numpy as np
import polars as pl

# Set randomization seed and n
rng = np.random.default_rng(42)
n = 10_000_000

# Discrete uniform distribution
disc_unif = np.random.randint(1, 7, size=n)
draws = pl.DataFrame(disc_unif, schema=['disc_unif'])
```

This is Quarto version 1.8.20 on macOS 15.6.1.

[mcanouil]

Could you properly format your post using code blocks for code and terminal outputs? Thanks.
If your code contains code blocks, you need to enclose it using more backticks, i.e., usually four ````.
See https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us.

self-contained is a three-years old deprecated option. The correct current option is embed-resources.

I cannot reproduce your issue on the latest release candidate.

Since you are using pre-releases, before reporting issues, please be sure to always use the latest.

[marcdotson]

Either the latest pre-release, Quarto version 1.8.24, or embed-resources solved the problem. Thanks!

[mcanouil]

Unlikely to be embed-resources as internally self-contained is converted to the right option.
But there was a PR to fix another issue the the copy button in the context of code-annotation which required a change in the JavaScript responsible of the copy of the content.

Anywho, glad the last pre-release does work properly for you.