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* Refactor oEmbed previews (#10814)Patrick Cloke2021-09-211-8/+13
| | | | | | | | | | | | | The major change is moving the decision of whether to use oEmbed further up the call-stack. This reverts the _download_url method to being a "dumb" functionwhich takes a single URL and downloads it (as it was before #7920). This also makes more minor refactorings: * Renames internal variables for clarity. * Factors out shared code between the HTML and rich oEmbed previews. * Fixes tests to preview an oEmbed image.
* Use attrs internally for the URL preview code & add documentation. (#10753)Patrick Cloke2021-09-071-0/+51