Issue #2787187 by claudiu.cristea, grahl, azinck, Fabianx, dawehner: Data loss: Deleting a translation of an entity deletes all file_usage entries for files referenced by the entity

Revert "Issue #2787187 by claudiu.cristea, grahl, azinck: Data loss: Deleting a translation of an entity deletes all file_usage entries for files referenced by the entity"

This reverts commit 81bb5b82.

Issue #2787187 by claudiu.cristea, grahl, azinck: Data loss: Deleting a translation of an entity deletes all file_usage entries for files referenced by the entity

(cherry picked from commit a1b670fb)
(cherry picked from commit 37e041d8)

Revert "Issue #2551785 by roland.molnar, nod_, MattA: Unable to scroll toolbar menu items or show contextual links on mobile browsers"

This reverts commit 8b401c2a.

Issue #2682461 by arunkumark, jonhattan, quietone, benjy, xjm, RavindraSingh, catch: Add links to documentation in all migrate process plugins

(cherry picked from commit 0ce97fb5)

Issue #2760905 by anavarre, claudiu.cristea, amitaibu, dawehner: The documentation should be more explicit about PHPUnit requesting the webserver user to perform all functional tests

(cherry picked from commit cf37e903)

Revert "Issue #2744197 by Boobaa, Wim Leers: Proper private file support for images uploaded via EditorImageDialog"

This reverts commit 46664f66.

Issue #2744197 by Boobaa, Wim Leers: Proper private file support for images uploaded via EditorImageDialog

(cherry picked from commit f2ed11ab)

(cherry picked from commit ed8ceb79)
(cherry picked from commit 5fd082b6)

Issue #2551785 by roland.molnar, nod_, MattA: Unable to scroll toolbar menu items or show contextual links on mobile browsers

(cherry picked from commit 85aea4e6)

Issue #2787619 by hussainweb, phenaproxima, alexpott: CckMigration does not type hint CckPluginManager correctly

(cherry picked from commit 0d74926e)

Issue #2618332 by phenaproxima, jonhattan, rakesh.gectcr, mikeryan, neclimdul: Better handle replacement of missing filters with filter_null

(cherry picked from commit ae25829c)

Issue #2787639 by hussainweb: MigrateCckFieldPluginManager mixes up its behaviour for creating and loading definitions

(cherry picked from commit cea3af0f)

(cherry picked from commit 06da5195)

(cherry picked from commit bfd9b82d)

(cherry picked from commit 17cd8920)

Issue #2777451 by markdorison, er.pushpinderrana, alexpott: @see references not forming links in documentation

(cherry picked from commit d262018e)
(cherry picked from commit a7e09eb2)

Issue #2490290 by willzyx, Mile23, alexpott, tim.plunkett: Subclasses of EntityListBuilder incorrectly override the #empty message

(cherry picked from commit f37eba61)

This reverts commit 82bece91.

(cherry picked from commit c90b15c7)

Issue #2782009 by alexpott, swentel, reblutus: Create a field with the same name as one being purged results in data destruction of the new field

(cherry picked from commit b6a64fc0)

(cherry picked from commit 6bdf44e8)

(cherry picked from commit 7f5305b0)

(cherry picked from commit 65898a54)

(cherry picked from commit fd8e8afc)

(cherry picked from commit 437ebf7c)

Issue #2747177 by markdorison, chx, Sonal.Sangale, andypost, joachim, Berdir, eojthebrave: Add docs on possible values of $operation in hook_entity_field_access()

(cherry picked from commit 71ca3778)

Issue #2740983 by VitalyM, alexpott: Configuration system doesn't allow importing a single item from a non-default collection

(cherry picked from commit 31dcacad)

(cherry picked from commit a9f61307)

Issue #2515050 by alexpott, pwolanin, YesCT, David_Rothstein, prasad_gogate: A valid one-time login link may be leaked by the referer header to 3rd parties

(cherry picked from commit 21d1b479)

Issue #2762173 by megansanicki, artinst4, YesCT, mradcliffe, a_thakur, vermauv, cilefen, mathieso, pwolanin, mlhess: Add "composer install" step to install.txt file for when Drupal is downloaded using git

Issue #2702227 by claudiu.cristea, jeroen.b, marco.giaco: Image styles for private files are serving the original instead of derivative

(cherry picked from commit bba2fda3)

(cherry picked from commit e0258752)

(cherry picked from commit 6fc9b0d8)

(cherry picked from commit 73333c5b)

Issue #2406533 by alexpott, willzyx, olli, Berdir, DamienMcKenna, Dom., Crell, Wim Leers, mdrummond, mirzu, enjoyiacm, catch: edit-form, delete-form etc. <link> tags added on /node/{node} are invalid according to W3C Validator

(cherry picked from commit 182f0316)

(cherry picked from commit da0645c1)

Issue #2783849 by Shashwat Purav, kiamlaluno: hook_filetransfer_info() documentation has not been updated for Drupal 8

(cherry picked from commit db998a72)