### Bug description

Apparently, `r-fit-text` takes into account the LaTeX "source" characters instead of the displayed ones when calculating the size of the text.

I am running quarto in preview mode, which might have to do with this issue.

The following example illustrates the problem:  

```md
---
format:
  revealjs:
    center: true
---

## Title

::: {.r-fit-text}
r-fit-text and LaTeX don't play well with each other: $\mathcal{N}(\mathcal{a},\mathcal{b},\mathcal{c})$
:::

::: {.r-fit-text}
r-fit-text and LaTeX don't play well with each other: N(a,b,c)
:::

```

Output:

![image](https://user-images.githubusercontent.com/19517248/176703223-9e9c2c56-6157-48dd-9bfc-5ef2cc242d79.png)

Edit: I just noticed that if the slide in question is not being currently displayed in the browser (e.g. another slide or tab is being displayed) then the line with LaTeX output is displayed correctly. This makes me think that there might be a race condition related to the time MathJax takes to render the LaTeX equations.

### System info

quarto-cli git version: `d7a4cf1cc`

```
❯ quarto check

[✓] Checking Quarto installation......OK
      Version: 99.9.9
      Path: /home/mroavi/repos/quarto-cli/package/dist/bin

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.10.4
      Path: /usr/bin/python3
      Jupyter: 4.10.0
      Kernels: julia-1.5, julia-1.7, python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/
```

I'm not using  RStudio IDE.

My system:
```
OS: Manjaro Linux x86_64
Host: XPS 13 9360
Kernel: 5.15.36-1-rt41-MANJARO
```


### Checklist

- [X] [formatted your issue](https://yihui.org/issue/#please-format-your-issue-correctly) so it is easier for us to read?
- [X] included a minimal, self-contained, and reproducible example?
- [X] documented the quarto version you're running, by providing the output produced by `quarto check` in a terminal in your issue?
- [X] documented the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] documented which operating system you're running? If on Linux, please provide the specific distribution as well.
- [X] upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?
2022-06-30T14:35:08Z
mroavi
bug
Future
open
reveal.js: r-fit-text and LaTeX don't play well with each other
https://github.com/quarto-dev/quarto-cli/issues/1258