`.background-image-svg-quick()` in 'mediawiki.mixins.less [[ https://codesearch.wmflabs.org/search/?q=.background-image-svg-quick&i=nope&files=&repos= | has never seemed to get traction ]].
Even though it follows the DRY principle, I think we should remove centralized code complexity and leave it up to certain projects to have a solution like it implemented themselves.
The original reason (72fc2a68f44a7) to circumvent RL `@embed` has also been gone for a while now: 792ba935677.
SVG fallbacks needs in general should go away anytime soon as well: https://caniuse.com/#feat=svg-css
== Proposal
[] Deprecate mixin
[] Remove mixin in next version of MediaWiki
== Background
Questioning this started in early versions of https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/WikiEditor/+/499881/4/modules/jquery.wikiEditor.dialogs.config.less when thinking about need for the mixin use.