Issue #665790 by chrisrockwell, Sumit kumar, lauriii, joelpittet, sun, vulcanr, vaplas, yoroy, leahtard, tompagabor, aspilicious, ckrina, Gábor Hojtsy, David_Rothstein, Manuel Garcia, rootwork, nod_, kostyashupenko, pguillard, Bojhan, droplet, typhonius, wturrell, mgifford, webkenny, cosmicdreams, tkoleary, YesCT, marcvangend, markabur, LewisNyman, mrfelton, oriol_e9g, prabhu9484, catch, hedrickbt, tsvenson, longwave, dww, kika, borisson_, rdellis87, realityloop, klonos: Redesign the status report page

Issue #2667242 by Anul, felribeiro, eojthebrave, pranavbabbar: Use consistent terminology when referencing administration themes in the UI (not "admin theme")

Issue #2090937 by darketaine, thpoul, Wim Leers, ironkiat, kostyashupenko, himanshugautam, Cottser, davidhernandez, Reinmar, Bojhan, tic2000, LewisNyman, emma.maria: Seven theme: style CKEditor-native dialogs to match Drupal-native dialogs

Issue #2575533 by leolando.tan, AlviMurtaza, LewisNyman, j2r, joaogarin: Add warning message to Seven and Bartik that they can change in the future

Issue #2566855 by HOG, andypost, irina.pusko: Load tour CSS in the Seven theme only when the module enabled

Issue #2580255 by Wim Leers: Remove (classy|seven)_library_info_alter() in favor of libraries-extend

Issue #2451411 by almaudoh, Shamsher_Alam, lauriii, borisson_, cilefen, davidhernandez, Cottser, Wim Leers, joelpittet: Add libraries-override to themes' *.info.yml

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 #507488 by lauriii, mdrummond, Wim Leers, Manuel Garcia, pwolanin, davidhernandez, chx, jibran, andypost, dawehner, Xano, tuutti, Gábor Hojtsy, LewisNyman, maximiliam, eiriksm, borisson_, bill richardson, Fabianx, joelpittet, Jeff Burnz, xjm, webchick, Bojhan, EclipseGc, emma.maria, tim.plunkett: Convert page elements (local tasks, actions) into blocks

Issue #2470807 by LewisNyman, Dom., davidhernandez, emma.maria, lauriii, jp.stacey: Rename the default "Messages" region for all themes to "Highlighted"

Revert "Issue #2470807 by LewisNyman, Dom., davidhernandez, emma.maria, jp.stacey, lauriii: Rename the default "Messages" region for all themes to "Highlighted""

This reverts commit 249e520b.

Issue #2470807 by LewisNyman, Dom., davidhernandez, emma.maria, jp.stacey, lauriii: Rename the default "Messages" region for all themes to "Highlighted"

Issue #2389735 by lauriii, iMiksu, davidhernandez, larowlan, loopduplicate, LewisNyman, Wim Leers, dawehner, Cottser: Core and base theme CSS files in libraries override theme CSS files with the same name

Issue #2289917 by Wim Leers, mdrummond, lauriii, Manuel Garcia, emma.maria, Scionar, davidhernandez: Convert "messages" page element into blocks

Issue #2306407 by lauriii, penyaskito, mortendk, pakmanlh, Wim Leers, ypogue: Remove breadcrumb from page template

Issue #2235901 by alexpott, mdrummond, iMiksu, sun, Wim Leers: Remove custom theme settings from *.info.yml

git commit -m 'Issue #2377397 by Wim Leers, alexpott: Themes should use libraries, not individual stylesheets'

Issue #2028053 by vegantriathlete, franxo, InternetDevels, thamas, rootwork, LewisNyman: Add typographic styles, components, and utility classes.

Issue #2337379 by skippednote, BarisW, derjochenmeyer, herom, ChandeepKhosa, kiliweb, sqndr, Palashvijay4 | LewisNyman: Rename 'branding' to 'content-header'.

Issue #2329501 by alexpott, mdrummond, davidhernandez | Cottser: Add classy.info.yml to core, set Classy as base theme for Bartik and Seven.

Issue #2213583 by lauriii, sqndr, Crisz, herom, jamesquinton, esod, Rajendar Reddy, zserno, er.pushpinderrana, cs_shadow, amitgoyal | JayeshSolanki: Fixed Misaligned Icons in Drupal 8.x.

Issue #2033211 by jwilson3, LewisNyman, sqndr, tim.plunkett, JamesLefrère | yannickoo: Move Seven CSS files into css directory.

Revert "Issue #2033211 by LewisNyman, tim.plunkett, JamesLefrère | yannickoo: Move Seven CSS files into css directory."

This reverts commit 16e60c42.

Issue #2033211 by LewisNyman, tim.plunkett, JamesLefrère | yannickoo: Move Seven CSS files into css directory.

Issue #2017257 by jason.bell, dead_arm, alexrayu, philipz, idebr, rteijeiro, emma.maria, frankbaele, LewisNyman: Create generic layout classes.

Issue #2193691 by holly.ross.drupal, Bojhan, BLadwin | mgifford: New methods, standards for describing Seven themes admin page.

Issue #2113911 by LewisNyman, Manuel Garcia, longwave, nod_, Rajendar Reddy, pakmanlh, olemedia, rteijeiro: Modal style update.

Issue #1989470 by LewisNyman, aboros, philipz, mgifford, rteijeiro, dimaro, Bès, klonos, emma.maria: Dropbutton style update for Seven.

Issue #1921044 by pakmanlh, Manuel Garcia, rteijeiro, dasjo, aboros, sqndr, LewisNyman: Align the styling of tool tips to be more consistent with Seven.

Issue #2218655 by sun, effulgentsia, jessebeach: Core expects $theme.settings default config file to exist.

Broke Bartik, still needs discussion.

This reverts commit 5a8a34e8.