Issue #2920536 by Wim Leers, Grayside: Force all serializer encoders + normalizers services to be private

Issue #2935137 by el7cosmos, Mixologic: License "GPL-2.0+" is a deprecated SPDX license identifier, use "GPL-2.0+-only" or "GPL-2.0+-or-later" instead

Issue #2938187 by markconroy, andrewmacpherson: Homepage/Recipes page banner image is duplicating on small screens

Issue #2872355 by sarguna raj M, chiranjeeb2410, joachim: expand and clarify docs for DefaultPluginManager::alterInfo()

Issue #2938369 by Mohit Malik, yo30, mondrake, alexpott: The Symfony\Component\ClassLoader\WinCacheClassLoader class is deprecated

Issue #2921706 by Daniel Korte, bkosborne: Update example.settings.local.php to include ['cache']['bins']['page']

Issue #2914834 by snehi, tresti88, joachim: missing @return for drupal_get_user_timezone() and return types for other methods in bootstrap.inc

Issue #2935254 by kim.pepper: Remove all usages of drupal_get_message and drupal_set_message in core includes

Issue #2937636 by piyuesh23, markconroy: Umami Theme - follow-up - Use hook_form_alter() for search block placeholder

Issue #2930542 by sahil432, sdewitt, andrewmacpherson: Disabled form labels in Seven theme's node meta-data  do not meet WCAG AA 1.4.3 Contrast (minimum)

Issue #2878556 by plach, matsbla, vijaycs85, Gábor Hojtsy, catch, gabesullice, effulgentsia, hchonov, hass, amateescu, xjm: Ensure that changes to untranslatable fields affect only one translation in pending revisions

Issue #2919373 by tedbow, Wim Leers, Adita, webchick, Berdir, drpal, xjm, samuel.mortenson, bircher: Prevent Settings Tray functionality for blocks that have configuration overrides

Issue #2937889 by larowlan, Sam152: Regression: LinkWidget no longer supports base fields with optional title

(cherry picked from commit 7871cc00)

Issue #2809635 by markconroy, navneet0693, alexpott, smaz, larowlan, Eli-T, webchick, yoroy, ikit-claw, budda, kjay, timmillwood, tkoleary, Gábor Hojtsy, andrewmacpherson, lauriii, JayKandari, jibran, ok_lyndsey, big_man, ckrina, nathancz, Paul_Gregory, vijaycs85, SharJay, tomphippen, tim.plunkett, Tarun Lewis, cehfisher, kreynen, Petr Illek, mariohernandez, thamas, thatdamnqa, John Cook, philipnorton42, h2cm, kattekrab, martin_q, waako: Create experimental installation profile

Issue #2927746 by alexpott, catch, slasher13, mpdonadio, martin107, RoSk0, jibran, larowlan, pounard, Mile23, Jo Fitzgerald, deviantintegral, pritish.kumar: Update Symfony components to 3.4.*

Issue #2908952 by sahil432, martin107: drupal_get_complete_schema() and drupal_get_schema() are not completely removed

(cherry picked from commit a0f31bc7)

Issue #2862748 by masipila, Jo Fitzgerald, quietone, phenaproxima: Add documentation to EntityRevision destination plugin

(cherry picked from commit 253b1020)

Issue #2933773 by masipila, quietone: Merge handbook documentation to API: skip_on_empty process plugin

(cherry picked from commit 36ea4d33)

Issue #2933776 by masipila, quietone: Merge handbook documentation to API: sub_process process plugin

(cherry picked from commit ed35f803)

(cherry picked from commit 02af9bc3)

Issue #2543726 by damiankloip, Wim Leers, claudiu.cristea, voleger, dagmar, dawehner, amateescu, tedbow, FredCorreia, mgalalm, caseylau, jibran, dbjpanda, pcambra, Grimreaper, idebr, dmouse, larowlan, Berdir, chx, andypost, yched, fgm: Make $term->parent behave like any other entity reference field, to fix REST and Migrate support and de-customize its Views integration

Issue #2936793 by tim.plunkett, tstoeckler, EclipseGc: EntityReferenceItem::generateSampleValue() should create a sample entity if a referenceable entity is not found

Issue #2935779 by tim.plunkett, EclipseGc, webchick, xjm, dead_arm: Come up with an affordance for what parts of the page are/are not affected by Layout Builder

Issue #2902187 by amateescu, timmillwood, Sam152, webchick, Manuel Garcia, xjm, plach, DuneBL, larowlan, Bojhan, jibran, Berdir, jojototh: Provide a way for users to moderate content

Issue #2936457 by Berdir, larowlan: views_post_update_filter_placeholder_text() can result in errors in filter plugins due to incomplete definition

Issue #2862422 by chr.fritsch, robpowell, phenaproxima, webflo, bdimaggio, seanB, naveenvalecha, sunset_bill, vijaycs85, yoroy, starshaped, xjm, Berdir, hazong: Add per-media type creation permissions for media

Issue #2935755 by alexpott, Wim Leers: Add a trait to allow dynamic setting of expected deprecations