Vim's swap file breaks refresh of MDX documents

[jgosmann]

Preliminary Checks

• This issue is not a duplicate. Before opening a new issue, please search existing issues: https://github.com/gatsbyjs/gatsby/issues
• This issue is not a question, feature request, RFC, or anything other than a bug report directly related to Gatsby. Please post those things in GitHub Discussions: https://github.com/gatsbyjs/gatsby/discussions

Description

I'm using gatsby-plugin-mdx to create pages from MDX files. If I run Gatsby in development mode and edit one of those files with Vim (and active swapfile option), the refresh of the page in the browser breaks, i.e. the content is not updated. A hard refresh does not help either. Closing Vim and removing the swap file does not solve the issue; one has to restart gatsby develop to see updates again.

Using different editors or deactivating the swap file, the refresh works as expected (if it was not broken beforehand by using Vim).

Reproduction Link

https://github.com/jgosmann/gatsby-mdx-broken-refresh

Steps to Reproduce

1. Run Gatsby in development mode: npx gatsby develop
2. Open http://localhost:8000/main in your browser
3. Open this file with Vim: vim src/content/main.mdx
4. Ensure the swap file is active: :set swapfile
5. Edit this file and save it.
6. Observe that (despite Gatsby output in the terminal) the page in the browser won't update. (Maybe it will still on the first saved edit, but after the second edit it should no longer.)
7. Closing Vim (and thus removing the swap file), won't restore the update. Even when using a different editor, the page won't update.

Expected Result

Even when editing with Vim (and when a swap file is created), the page refreshes with the new content in the development mode.

Actual Result

The page does not refresh with new content.

Environment

System:
    OS: macOS 13.4.1
    CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
    Shell: 5.9 - /opt/local/bin/zsh
  Binaries:
    Node: 20.2.0 - /opt/local/bin/node
    Yarn: 1.22.19 - /opt/local/bin/yarn
    npm: 9.7.1 - /opt/local/bin/npm
  Languages:
    Python: 3.11.3 - /opt/local/bin/python
  Browsers:
    Chrome: 114.0.5735.198
    Safari: 16.5.1
  npmPackages:
    gatsby: ^5.12.0-next.0 => 5.12.0-next.0
    gatsby-plugin-mdx: ^5.11.0 => 5.11.0
    gatsby-source-filesystem: ^5.11.0 => 5.11.0
  npmGlobalPackages:
    gatsby-cli: 3.5.0

Config Flags

System:
    OS: macOS 13.4.1
    CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
    Shell: 5.9 - /opt/local/bin/zsh
  Binaries:
    Node: 20.2.0 - /opt/local/bin/node
    Yarn: 1.22.19 - /opt/local/bin/yarn
    npm: 9.7.1 - /opt/local/bin/npm
  Languages:
    Python: 3.11.3 - /opt/local/bin/python
  Browsers:
    Chrome: 114.0.5735.198
    Safari: 16.5.1
  npmPackages:
    gatsby: ^5.12.0-next.0 => 5.12.0-next.0
    gatsby-plugin-mdx: ^5.11.0 => 5.11.0
    gatsby-source-filesystem: ^5.11.0 => 5.11.0
  npmGlobalPackages:
    gatsby-cli: 3.5.0