c9fec61b6c
The image picker plugin's implementation doesn't currently handle multiple calls correctly due to the use of an ivar to track the response object; the original entry point handles that by cancelling earlier requests when new ones come in, but as we added more entry points we didn't replicate that logic. This adds it to all picker entry points. (Longer term, we should instead handle multiple concurrent calls, but this is consistent with historical behavior, and is better than having some `await`s on the Dart side never return as can happen now.) The newer PHPicker code path not only didn't cancel, but used an ivar for the picker view controller, which in some cases could result in the same controller being presented multiple times, crashing the app (see referenced issue). While the new cancel calls will prevent that case from happening, to prevent anything similar from happening in the future this removes the ivar entirely, since we can just pass the controller to the necessary methods (as is already being done with the `UIImagePickerController` paths). Fixes https://github.com/flutter/flutter/issues/108900
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