Also, the change in insert-hyperlink (from `this.linkUrl.indexOf("http") === -1` to `!this.linkUrl.startsWith("http")`) was intentional fix: we don't want to prevent users from looking up topics with http in their titles.
Seems to only be a problem when a markdown.it rule inserts links without a attribute value. There's no test, because it's not reproducible with the markdown rules in core.
Previously, our `upload://` protocol urls were only supported in markdown image tags. This meant that our PullHotlinkedImages job was forced to convert `<img` tags to markdown. Depending on the exact syntax, this can actually cause the image to break.
This commit adds support for `upload://` inside regular HTML `<img` tags. In a future commit, we'll be able to use this to make our PullHotlinkedImages job much more robust.
Context at https://meta.discourse.org/t/152801
eslint --fix is capable of fix it automatically for you, ensure prettier is run after eslint as eslint --fix could leave the code in an invalid prettier state.
