In various places we are using these deprecated classes. Let's stop doing this immediately by moving to use mw-ui-progressive to stop further confusion.
See
* https://github.com/search?q=org%3Awikimedia+mw-ui-primary&type=Code
* https://github.com/search?q=org%3Awikimedia+mw-ui-constructive&type=Code
= Core
[] In documentation (wikimedia/mediawiki – forms.less and inputs.less)
[] EditPage uses mw-ui-constructive
= Skins
== Using mw-ui-primary
[x] Timeless (this seems to maintain its own unused version of this class)
[x] Tempo (this seems to maintain its own unused version of this class)
= Extensions
== Using mw-ui-constructive and mw-ui-primary
[x] Translate - https://gerrit.wikimedia.org/r/313227
[x] CentralAuth - https://gerrit.wikimedia.org/r/313312
[X] OAuth - https://gerrit.wikimedia.org/r/313313
== Using mw-ui-primary
[x] Petitions - https://gerrit.wikimedia.org/r/313314
[x] UploadWizard T146936 https://gerrit.wikimedia.org/r/#/c/313424/
== Using mw-ui-constructive
[x] Popups https://gerrit.wikimedia.org/r/313391
[x] TwnMainPage https://gerrit.wikimedia.org/r/313392
[x] MobileFrontend https://gerrit.wikimedia.org/r/313228
[] Flow
[x] Timeless https://gerrit.wikimedia.org/r/#/c/313396/ (the skin just has definitions for buttons, so shouldn't be a blocker)
[x] Thanks https://gerrit.wikimedia.org/r/#/c/313394/
[] ContentTranslation
[] UniversalLanguageSelector
[x] WikiLove https://gerrit.wikimedia.org/r/313397
[] GuidedTour