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## What's new? - Added the `windowing` feature flag to the project - Created the internal `_window.dart` API with support for regular windows - Implemented a `_WindowingOwnerUnsupported` implementation of the `WindowingOwner` interface - Marked all points of the public API as `@internal` with a corresponding warning documentation - Threw an `UnsupportedError` where it is appropriate to do so Note that this PR does **NOT** include a real implementation of `WindowingOwner` (e.g. for win32 or macOS). That work will be opened as a follow up. This work is based off of https://github.com/flutter/flutter/pull/168697 and http://github.com/flutter/flutter/pull/168437, as well as this design document: https://docs.flutter.dev/go/multi-window-experimental-apis ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. --------- Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>