[webview_flutter] Expose the allowsLinkPreview property in WKWebView for iOS

[b099l3]

This PR fixes this issue:

• https://github.com/flutter/flutter/issues/69748
• (duplicate) https://github.com/flutter/flutter/issues/100783

Exposes the allowsLinkPreview boolean property on WKWebview. To enable or disable link previews.

Pre-launch Checklist

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

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[bparrishMines]

Hi @b099l3, thanks for the contribution! We're currently working on reworking the plugin interface and converting the platform implementation to mirror the native apis. We have a current halt on new features until these two issues are complete. We'll revisit this PR/issue thereafter.

[stuartmorgan]

The Dart conversion is complete, and this doesn't change anything problematic in the platform interface, so this is unblocked now. You'll just need to update the implementation for the new Dart version.

[b099l3]

nice I'll take a look this weekend

[bparrishMines]

@b099l3 Was this ready for another review? Are you still working on it?

[b099l3]

Hi sorry still working on it, had to get my head back in the code, looking at it today

[b099l3]

Fix the dart update and comments but notice the platform has changed for 4.0.0, so making my changes fit the new structure.

[b099l3]

@bparrishMines I should be ready for a review now. Sorry for the delay I have never used pigeon before and was working out how to generate the files.

I noticed that the version for pigeon was different:

• web_kit.pigeon.dart & test_web_kit.pigeon.dart are on 3.1.5 and
• FWFGeneratedWebKitApis.m & FWFGeneratedWebKitApis.h are on 3.2.6 so I went with the higher one

[b099l3]

Cool think this is good for a review @bparrishMines when you have time

[b099l3]

@bparrishMines I'm getting some funky test failures but I don't think I have changed that code. I have made the changes from the review

[bparrishMines]

The ios-build_all_plugins CHANNEL:stable is failing due to an infra error. It should pass on a rerun. ios-platform_tests CHANNEL:master is failing due to a flake. It should pass on a rerun as well.

[stuartmorgan]

This will need to be updated for the restructuring in webview_flutter v4; once that's done we can re-review. Apologies that this fell through the cracks on secondary review while the v4 changes were happening, but we can make sure to review faster once it's updated.

[stuartmorgan]

I'm going to go ahead and mark this as a draft since it needs to be reworked for v4, just to get it off of our review queue. Please mark it as ready for review once that's been done. Thanks!

[stuartmorgan]

We've just completed the migration of the plugin code to the flutter/packages repository, as described in https://flutter.dev/go/flutter-plugins-repo-migration, and this repository is now being archived. Unfortunately that means that all in-progress PRs here must be moved to flutter/packages.

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