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## What's new? This pull request makes it so that multi window applications can be tested via `testWidgets`. This PR implements the following: - A `_TestWindowingOwner` that is used by the `TestWidgetsFlutterBinding` - A `_TestRegularWindowController` implementation - A `_TestDialogWindowController` implementation - A `_TestFlutterView` and `_TestDisplay` for use by the controllers - Proper `isActivated` status across controllers - Proper minimization, maximization, and fullscreen status - Proper sizing (based on constraints) - Using the new testing abilities in the multiple windows example app I have purposefully not implemented tooltip windows yet, as they are still awaiting an implementation in Win32 to be useful. ## 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.