Issue #229193 by dmitrig01, narendraR, katbailey, k4v, Gurpartap Singh, anavarre, kkaefer, chx, Gábor Hojtsy, jrockowitz, Bojhan, catch, Kiphaas7, corey.aufang, webchick, Dries, Senpai, smustgrave, anders.fajerson, larowlan: Incremental filter for permissions page

Issue #3244737 by longwave, droplet, andypost, joshua1234511, Satyajit1990, klonos: "core/drupal.checkbox" (misc/checkbox.js) has never loaded on user permission page

Issue #3061265 by lauriii, quiron, Niyas, bnjmnm, huzooka, catch: Use specific class for password confirm message

Issue #2566771 by Cottser, mortendk, jstoller, LewisNyman, mdrummond, Gints Ērglis, sqndr, Chernous_dn, Manjit.Singh, axe312, emma.maria, davidhernandez, lauriii, jaxxed, akalata: [Voltron patch] Move all remaining *.theme.css to Classy

Issue #1663210 by mortendk, rootwork, idebr, vks7056, ishmael-sanchez, LewisNyman, joelpittet, Manjit.Singh, Manuel Garcia, b0unty, prajaankit, alansaviolobo, atu: Clean up css in the User module

Issue #2368739 by Wim Leers: Fixed user_page_attachments() unnecessarily adds an individual CSS file on every page.

Issue #1996238 by sun, nod_, damiankloip, Wim Leers, longwave, alexpott, Xano, mdrummond, Mark Carver, Jeff Burnz, highrockmedia, joelpittet, et al: Replace hook_library_info() by *.libraries.yml file.