Cause

It looks like a recent Flutter change caused the following to no longer be true.

const int a = 1;
Object.hash(a, 'a') == Object.hash(a.hashCode, 'a');

Each subclass of CameraEvent overrides int get hashCode and uses

int get hashCode => Object.hash(super.hashcode, ...);

While CameraEvent uses the hashCode of cameraId:

int get hashCode => cameraId.hashCode;

With the equality at the top no longer being true, this causes the failing tests.

Fix

To fix this we could:

1. Change all event classes to use cameraId instead of super.hashCode.
2. (The current option). Change tests to use cameraId.hashCode in the test expectation.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/plugins repo does use dart format.)
• I signed the CLA.
• The title of the PR starts with the name of the plugin surrounded by square brackets, e.g. [shared_preferences]
• I listed at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

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