48936 Roll engine 348805107fe1..be20fb661a69 (8 commits) (autoroller: commit, cla: yes)

48938 Roll engine be20fb661a69..09d892b3bf5d (2 commits) (autoroller: commit, cla: yes)

48942 Roll engine 09d892b3bf5d..8c855dba98eb (1 commits) (autoroller: commit, cla: yes)

48947 [bugfix] SliverGeometry is not valid: The “layoutExtent” is negative (cla: yes, f: scrolling, framework, severe: crash, waiting for tree to go green)

48948 [Form] Add is valid to FormState (cla: yes, framework, severe: new feature, waiting for tree to go green)