Sources: release notes 3.47.0, breaking changes, CHANGELOG.md
Impeller's OpenGL ES backend now stores render-to-texture content top-down, the same as the Metal and Vulkan backends. A fragment shader or Flutter GPU app that sampled a render-target texture on OpenGL ES and added a vertical flip to compensate for the old bottom-up orientation now renders that content upside down.
The `header` semantics property now behaves as a no-op on iOS and Android. To declare a section heading for accessibility purposes on these platforms, use the `headingLevel` property with a value greater than `0`.
The `describeEnum` method has been removed from the framework because it's redundant with the `name` getter on `Enum` which was introduced in `Dart 2.14`.
Remove use of deprecated copy_trees. (Other changes, by @rmacnak-google).
Remove use of deprecated API related to removal of the VM isolate. (Other changes, by @rmacnak-google).
[Android] Test to verify AnnounceSemanticsEvent deprecation warning on API 36 (Android, by @mboetger).