Issue #3236540 by beatrizrodrigues, gabrielda, ankithashetty, Chi, larowlan, lauriii: Wrong documentation in comment.html.twig

Issue #3173007 by mherchel, kishor_kolekar, komalk, raman.b, kostyashupenko, paulocs, proeung, bnjmnm: [Code Review] Provide a BEM methodology to comments.pcss.css partial

Issue #3111409 by mherchel, proeung, larowlan, alexpott, lauriii, Gábor Hojtsy, andrewmacpherson, catch, xjm, andypost, rahulrasgon, rabbitlair, mrconnerton, poojakural, boulaffasae, jerseycheese, shimpy, Indrajith KB, DuneBL, kiran.kadam911, komalkolekar, keboca, hawkeye.twolf, andrewozone, Maithri Shetty, alexdmccabe, sd9121, Sreenivas Bttv, katannshaw, mgifford, nod_, webchick, mtift, rainbreaw, Berdir, brianperry, thejimbirch, Dom., q0rban, nitesh624, hansa11, himanshu_sindhwani, kostyashupenko, shaktik, bnjmnm, sharma.amitt16, sonam.chaturvedi, steinmb, shaal, ressa, Ramya Balasubramanian, Sebacic, pradeepjha, tanmaykadam, thedrupalkid, vinitk, volkswagenchick, viappidu, vebrovski, Ujval Shah, Webbeh, Yuri, trebormc, msuthars, mrinalini9, bash247, chetanbharambe, ellenoise, anevins, andriyun, CocoM, JayKandari, ambuj_gupta, hussainweb, jhodgdon, Pooja Ganjage, ju.vanderw, jwitkowski79, MaxPah, Lokender Singh2, jponch, KarenS, KarinG, Lal_: Add new Olivero frontend theme to Drupal 9.1 core as beta; later make it stable and the default

Issue #2945513 by jpoesen, johnnny, Meenakshi.g, idebr, nno: Variable comment_parent in comment.html.twig should be parent_comment

Issue #2566597 by Cottser, LewisNyman, mdrummond, pjbaert, jaxxed, ManuelGarcia, emma.maria, maked1sky, davidhernandez: [Mega patch] Move system *.theme.css files to Classy

This reverts commit 7cabfeee.

This reverts commit fb07e7bb.

Issue #2031883 by mortendk, rachel_norfolk, andypost, zestagio, epari.siva, nguerrier, Manjit.Singh, rteijeiro, MathieuSpil, pablo.guerino, HOG, lauriii, LewisNyman, joelpittet, Wim Leers, Cottser, minneapolisdan: Markup for: comment.html.twig

Issue #2349759 by davidhernandez, mortendk, rteijeiro, harish86, Sumit kumar, saki007ster, Mukeysh, brahmjeet789, nitishchopra, falkendk, Maninder, Vidushi Mehta, Ashish sandil, jitendra verma, crowdcg, sivaji@knackforge.com, dernetzjaeger: Copy system templates to Classy.

Issue #2372909 by Tom Verhaeghe: Comments to check '$comment->getOwner->isAnonymous()' instead of assuming anonymous is ID 0

Issue #2329783 by lauriii, jamesquinton | davidhernandez: Move comment classes from preprocess to templates.

Issue #2271349 by Berdir, Arla, blueminds, larowlan, Dave Reid: Node and Comment ops links should be display components (which can be disabled).

Issue #2170251 by lauriii, mgifford, joshi.rohit100, lokapujya, mparker17, Mirabuck, Jalandhar: Fixed Comment headings can spit out empty heading tags.

Issue #2114563 by joelpittet, martin107, Cottser: Remove TwigReference with the help of 'without' filter replacing 'show'/'hide' functions.

Issue #731724 by larowlan, andypost, dixon_, tsvenson: Convert comment settings into a field to make them work with CMI and non-node entities.

Issue #1991684 by Wim Leers, rcaracaus, amateescu, msonnabaum: Fixed Node history markers (comment & node 'new' indicator, 'x new comments' links) forces render caching to be per user.

Issue #2013094 by pwieck, Cottser: Remove unnecessary template_preprocess() reference from all Twig files

Issue #1363112 by mparker17, mgifford, tlattimore, Jacine, dcmouyard, bowersox, ry5n, ahdiaz: Simplify names of 'element-x' helper classes.

Issue #1898054 by pixelmord, jenlampton, steveoliver, EVIIILJ, c4rl, vlad.dancer, Fabianx, joelpittet, jwilson3, thedavidmeister, shanethehat, Cottser: Convert comment module to Twig.