API documentation:

Layer

MouseRegion

RenderMouseRegion

AnnotatedRegionLayer

AnnotationResult

Relevant issues:

Breaking Proposal: MouseRegion defaults to opaque; Layers are required to implement findAnnotations

Relevant PRs:

Initially changed in #37896

Deprecated in #42953

Removed in #73749

BinaryMessages

Supported by fix tool: No

Migration guide

defaultBinaryMessenger

ServicesBinding.instance.defaultBinaryMessenger

BinaryMessages

BinaryMessenger

BinaryMessages.handlePlatformMessage

ServicesBinding.instance.defaultBinaryMessenger.handlePlatformMessage

BinaryMessages.send