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Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
This PR tweaks `wrapWithDefaultView` (used by `runApp`) to raise a StateError with a legible error message when the `platformDispatcher.implicitView` is missing (for example, when enabling multi-view embedding on the web), instead of crashing with an unexpected `nullCheck` a few lines below.
* Before:
<img width="619" alt="Screenshot 2024-09-25 at 7 33 47â¯PM" src="https://github.com/user-attachments/assets/4897dd3c-bdd0-4217-9f23-7eee9fab4999">
* After:
<img width="613" alt="Screenshot 2024-09-26 at 5 01 49â¯PM" src="https://github.com/user-attachments/assets/3febb91d-a8c3-41b6-bf34-c2c8743b637c">
## Issues
* Fixes https://github.com/flutter/flutter/issues/153198
## Tests
Added a test to ensure the assertion is thrown when the `implicitView` is missing. Had to hack a little because I couldn't find any clean way of overriding the `implicitView`. The problem is that the flutter_test bindings [use `runApp` internally](8925e1ffdf/packages/flutter_test/lib/src/binding.dart (L1020)) a couple of times, so I can only disable the implicitView inside the test body (and must re-enable it before returning). Not sure if it's the best way, but it seems to do the trick for this simple test case!
`FakeView` wraps the same underlying `FlutterView`. Sending semantics updates and Scene objects from multiple fake views into the same engine `FlutterView` violates contracts with the engine. This PR stubs out `render` and `updateSemantics` methods in `FakeView` classes to prevent that.
This unblocks https://github.com/flutter/engine/pull/48251, which implements multi-view semantics for web.
