Description

On Android, there is an issue where it is possible for the onLaunch callback to be invoked multiple times. One way to produce this is

• Sent a notification a device when the app is terminated
• Tap on the notification to launch the app -> onLaunch should be called
• Tap back until the application is in the background
• Open the Recents screen (aka recent task/app list) and go back to the app
• onLaunch is called again

This is happening as when the application starts up again, it will call configure method that will in turn process the intent. However, when processing the intent it should check to make sure that the app isn't launched via the Recents screen. This PR as this guard in to prevent the issue from happening.

Note: for some reason, pub is failing to resolve the dependencies (didn't happen in the past) so I cannot try to out properly but had to a similar fix for my own plugin for local notifications. This is why I haven't ticked the box that the analyzer doesn't report any problems

Related Issues

• [firebase_messaging] clear intent after onLaunch invoked on Android #1887

Checklist

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• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• If the pull request affects only one plugin, the PR title starts with the name of the plugin in brackets (e.g. [cloud_firestore])
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See [Contributor Guide]).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (flutter analyze) does not report any problems on my PR.
• I read and followed the [Flutter Style Guide].
• I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy].
• I updated CHANGELOG.md to add a description of the change.
• I signed the [CLA].
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change (please indicate a breaking change in CHANGELOG.md and increment major revision).
• No, this is not a breaking change.