Uploads broken with subfolder installation

Contribute Bug
6

Managed to track post uploads down to this exact line:

https://github.com/discourse/discourse/blob/main/app/assets/javascripts/pretty-text/addon/sanitizer.js#L23

in particular,

  // relative urls
  if (/^\/[\w\.\-]+/i.test(href)) {
    return href;
  }

breaks because since my forum URL is being served out of an apache user-webdir (which I don’t have control over), it starts with a ~, which breaks that regex.
I’ve confirmed that modifying the character class to include ~ (as [\w\.\-~]) fixes the post uploads, but painfully avatar uploads are still broken!

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