(cherry picked from commit 6347dec5)
(cherry picked from commit e0c2d965)
(cherry picked from commit e46929c5)
(cherry picked from commit 44f8f8f1)
(cherry picked from commit 5c386edc)
Issue #2700335 by er.pushpinderrana, elakiyasamuel, malavya, therealssj, joachim, jhodgdon: hook_entity_update() and friends should document $entity->original (cherry picked from commit 0ceb441a)
(cherry picked from commit 8f2c0537)
(cherry picked from commit 5cd36afb)
(cherry picked from commit 8da13e6c)
(cherry picked from commit 395cb8ba)
(cherry picked from commit b9536062)
(cherry picked from commit 79f17dcb)
(cherry picked from commit ef39eed7)
(cherry picked from commit e8322e4f)
(cherry picked from commit 6ab5a3aa)
(cherry picked from commit 3eeaeb64)
(cherry picked from commit bb41144f)
(cherry picked from commit 6098437e)
(cherry picked from commit c2cbf733)
(cherry picked from commit 1003490b)
Issue #2702609 by Wim Leers, Berdir, Fabianx: Disable placeholdering (and BigPipe) on unsafe requests to help find forms as fast as possible (to allow EnforcedResponses to work) (cherry picked from commit 459ede5e65abfd02a69508cb19f5dcb95fc91c9a)
(cherry picked from commit 3a6cac15)
(cherry picked from commit 747be317)