Issue #3438895 by finnsky, larowlan, plopesc, m4olivei, ckrina, mherchel, catch, alexpott, nod_, deviantintegral, jwitkowski79, nod_, jponch, jwitkowski79, rkoller, Ana Barcelona, YurkinPark, finnsky, javi-er, alvarito75, ctrlADel, AaronMcHale, Emma Horrell, akshayadhav, claireristow, baluv3, bronzehedwick, NikMis, deviantintegral, hot_sauce, kostyashupenko, gnuschichten, keyboardcowboy, gdd, silviu, Prashant.c, ehsann_95, pjudge, rkoller, Shreya_th, starshaped, bal krishna, meeni_dhobale, mherchel, johnpicozzi, chetan_, saschaeggi, markie, iro, abhishek_gupta, vensires, KurtTrowbridge, hooroomoo, Utkarsh_33, Svitlana, starshaped, KeyboardCowboy, benjifisher, ahsannazir, tim.plunkett, tedbow, flanneryla, Anandt846, Kanchan Bhogade, SKAUGHT, joaopauloc.dev, Silviu S., q0rban, rabbitlair, bnjmnm, Mithun S, Akhil Babu, gaurav_manerkar, dead_arm, YurkinPark, lauriii, sani, chetan 11, DieterHolvoet, Gábor Hojtsy, jwilson3, marcelreimer: Add the new Navigation to core as an Experimental module

Issue #2866809 by BrightBold: Update stylelint rule declaration-colon-space-after to be consistent with Drupal's CSS standards

Issue #1510544 by swentel, Bojhan, Gábor Hojtsy, merlinofchaos, Cottser, Wim Leers, plopesc, aspilicious, sannejanssen,  larowlan, tim.plunkett, nod_: Fixed Show previews in front-end theme, able to select different view modes.

Issue #2056173 by philipz, Sam152 | tim.plunkett: Regression: Two-column layout is broken by vertical toolbar.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.