Where this introduced an inconsistency (e.g. assigning to something
called `windowIndex`), I generally renamed the transitive closure of
identifiers to maintain consistency (meaning this change is quite
large). The exception is code that interacts with Timeline and Window
directly, where sometimes I kept the 'window' nomenclature.
#minor-release
PiperOrigin-RevId: 407040052
Only deprecated references remain.
Usages of the deprecated methods will be migrated in a follow-up change.
#minor-release
PiperOrigin-RevId: 405927141
