Description

Updates the MediaQuery and MediaQueryData classes to include the viewPadding property & relevant functionality that was introduced in flutter/engine#8848.
This is part 1 of 2 on the way to fixing #29941, with implementation in the following classes to be added after this lands:

• material/Scaffold
• widgets/SafeArea
• cupertino/CupertinoTabScaffold
• cupertino/CupertinoPageScaffold

Related Issues

Addresses #29941

Tests

Updated Tests:

• MediaQueryData.copyWith defaults to source
• MediaQuery.copyWith copies specified values
• MediaQuery.removePadding removes specified padding
• MediaQuery.removeViewInsets removes specified viewInsets

Added:

• MediaQuery.removeViewPadding removes specified viewPadding

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require Flutter developers to manually update their apps to accommodate your change?

• No, this is not a breaking change.