Issue #2851648 by tim.plunkett, jibran: Layout regions should be in the order defined by the definition

(cherry picked from commit fee5c769)

(cherry picked from commit 667a05a0)

Issue #2821112 by vaplas, jibran, esolitos, nicholas.alipaz, gambry, Lendude, SylvainM: Views NumericFilter 'regular_expression' operator is broken

(cherry picked from commit 3da27e53)

Issue #2692091 by amateescu, heykarthikwithu, xjm, Berdir: Use the new 'view label' entity access check in the entity reference label formatter

(cherry picked from commit a6a513df)

(cherry picked from commit e05ae293)

Issue #2845543 by vaplas, gambry, alexpott: PostgreSQL regular expression match operators works only for text

(cherry picked from commit 39014648)

Issue #2843934 by mpdonadio, Gábor Hojtsy: datetime.schema.yml does not use the "built-in" date_format type

(cherry picked from commit 3404c729)

Issue #2822190 by webflo, Wim Leers, dawehner, alexpott, effulgentsia, SchnWalter: PathValidator validates based on a RequestContext leaked from the current request, resulting in false negatives during CLI requests and POST submissions

(cherry picked from commit 39d1e855)

Issue #2845478 by gerzenstl, quietone, Jo Fitzgerald, phenaproxima, John Cook, xjm, ultimike: Add documentation to Explode process plugin

(cherry picked from commit d313bdda)

Issue #2843565 by Berdir, swentel, yched: getViewBuilder('node')->viewMultiple() bypasses render cache

(cherry picked from commit 3f9882ff)

Issue #2841311 by hchonov, tstoeckler: Initialized fields of an entity clone have a reference to the original entity object instead to the cloned entity object

(cherry picked from commit 151050c7)

Issue #2845477 by gerzenstl, Jo Fitzgerald, quietone, phenaproxima, xjm: Add documentation to DefaultValue process plugin

(cherry picked from commit 559e61a4)

Issue #2287073 by Berdir, slashrsm, Denchev, jibran, Thew, dasjo, andypost, Arla, zaporylie, marvin_B8, piyuesh23, EclipseGc: Allow views contextual filters to expose the context using argument validation plugins

(cherry picked from commit 73312ef0)

(cherry picked from commit 24a4d4b6)

Issue #2845473 by Jo Fitzgerald, quietone, phenaproxima: Add documentation to Callback process plugin

(cherry picked from commit b078363c)

Issue #2845481 by Jo Fitzgerald, leslieg, quietone, phenaproxima: Add documentation to Flatten process plugin

(cherry picked from commit 6ae744ca)

Issue #1863020 by dawehner, catch, paulmckibben, sunset_bill, damiankloip, Lendude, alansaviolobo, amarnus, CurtisTAG, jlbellido, deveshpal9, rpayanm: View's build fails when an unrelated form on the same page has validation errors

(cherry picked from commit bfa73c9f)

(cherry picked from commit c7dd8211)

(cherry picked from commit 0c660e34)

Issue #2848933 by Wim Leers, tstoeckler: SerializationLinkManagerTest should not enable the rest_test module (because it implicitly enables the rest module)

(cherry picked from commit f2c2531c)

(cherry picked from commit ced2066c)

Issue #2845479 by Jo Fitzgerald, gerzenstl, quietone, Kifah Meeran, xjm, phenaproxima: Add documentation to Extract process plugin

(cherry picked from commit 5f8a8f41)

(cherry picked from commit 4577daf3)

Issue #2807785 by claudiu.cristea, OwilliwO, mpdonadio, cllamas, klausi, xjm, Berdir, Wim Leers, Mile23, daffie, Prashant.c, dawehner, sneha_surve: Move global constants from *.module files into interfaces

(cherry picked from commit a7c55977)

(cherry picked from commit ce118a00)

Issue #2793207 by SKAUGHT, Yogesh Pawar, Mukeysh, Cottser, webchick, tkoleary, alexpott: Fix off-set and goofy white jagged background of AJAX throbber when clicking Place Block

(cherry picked from commit c5cfdf94)

Issue #2848364 by Jo Fitzgerald, quietone: Convert Languages's Migrate source test to new base class

(cherry picked from commit 0ce44011)

Issue #2781907 by timmillwood, Sam152: Remove unnecessary constraint from moderation state transition validation

(cherry picked from commit 2a55d2d9)

Issue #2691971 by imrancluster, lluvigne, andrewmacpherson, royal121, John Cook, emallove, tstoeckler, alexpott, Cottser, ok_lyndsey, webchick: "Update Notifications" #title repeated for drupal 8 installation in configure site page

(cherry picked from commit e4ae1c1a)

Issue #2849628 by droplet, Lendude: Strange bar in View UI filters Modal when there are no filter options

(cherry picked from commit 25a734bb)

Issue #2850010 by anish.a, joachim, vmachado, tameeshb: Remove documentation references to deprecated function menu_local_tasks()

(cherry picked from commit ab563bac)

(cherry picked from commit 9f208e6f)

Issue #2845644 by vaplas, gaurav.kapoor, xjm, pgacv2, cilefen, alexpott, xmacinfo: Missing a space between two sentences

(cherry picked from commit c87ebca4)

This reverts commit b11516bb.

(cherry picked from commit e94f731d)

Issue #2847334 by dawehner, Wim Leers, Jaesin, EclipseGc: ContextAwarePluginBase should implement CacheableDependencyInterface

(cherry picked from commit a15d01f3)

Issue #2850670 by scott_euser, timmillwood: Add unit test coverage to ensure already existing transitions aren't allowed

(cherry picked from commit 0e666ab0)

(cherry picked from commit 178a615c)