Created by: MartijnCuppens
We're probably going to drop a lot of mixins, and maybe some functions in v5. That's why I would like to introduce a deprecate() mixin. This mixin will allow us to deprecate mixins and functions now. Its goal is that all functions/mixins that will be droped in v5 include this mixin so that it'll be easy to check if people are relying on deprecated stuff in their codebase if they want to upgrade from Bootstrap 4 to 5. (They can update to the latest v4 first where all the deprecate() mixins are included.)
I've put #28072, #28067 and #28066 hold for this (I acctually tought $ignore-warning was a global variable, which wasn't the case). Probably going to submit a lot more deprecation PRs (these won't be blocking the 4.3 release)