bug: Mermaind rendering in Markdown will not fold

[Krystian-KF]

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• [x] I have read all the snacks.nvim docs
• [x] I have updated the plugin to the latest version before submitting this issue
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Neovim version (nvim -v)

NVIM v0.11.0-dev-1775+g4a2a54f993

Operating system/version

Fedora 41

Describe the bug

Mermaid preview will persist even when the code block or a heading are folded and the source is not visible anymore. There is no issue with previews for the images itself or latex inline / part of the codeblock.

See the video for the better explanation.

https://github.com/user-attachments/assets/92f4db15-6ff6-4164-b34f-146f921a9936

There is another small issue visible in the video when unfolding the heading containing an image for the first time,. I have not played with it enough yet though. Let me know what you think, please as If it is needed I will log another bug report.

Steps To Reproduce

1. Enable inline preview.
2. Open example.md
3. Play with folds.

Expected Behavior

Preview to disappear when folded.

Repro

vim.env.LAZY_STDPATH = ".repro"
load(vim.fn.system("curl -s https://raw.githubusercontent.com/folke/lazy.nvim/main/bootstrap.lua"))()

require("lazy.minit").repro({
  spec = {
    { "folke/snacks.nvim", opts = {} },
    -- add any other plugins here
  },
})