Description

This PR adds a full-container opaque MouseRegion to the following widgets in order to prevent widgets behind it reacting to mouse events:

• ModalBarrier
• The barrier of Drawer

Check out related issues to see reason of this change.

How do I make sure they are all cases that need changing? I searched BlockSemantics and they are the only usages.

Related Issues

• Fixes Hover effects are incorrectly shown for all widgets under cursor. #32915
• Fixes Route should be opaque to MouseEnter/Exit events #33679
  • The behavior is fixed for ModalRoute (which applies to most common cases), but not its superclasses.

Tests

I added the following tests:

• Drawer hover test
• ModalBarrier prevents hover interactions with widgets behind it
• ModalBarrier does not prevent hover interactions with widgets in front of it
• an empty opaque MouseRegion is effective

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• 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?

• Yes, this is a breaking change (Please read Handling breaking changes). Replace this with a link to the e-mail where you asked for input on this proposed change.
• No, this is not a breaking change.