fix: [22091] Fixed PopupFlyoutBase.Opening not passing CancelEventArgs

[davidmfritz]

What does the pull request do?

Changed PopupFlyoutBase.Opening to pass CancelEventArgs.

What is the current behavior?

PopupFlyoutBase.Opening does not pass CancelEventArgs. a cast of (CancelEventArgs)EventArgs needs to be done to cancel the event.

What is the updated/expected behavior with this PR?

CancelEventArgs.Cancel can be used directly without casting.

Breaking changes

As of #22091 (comment), this is a BREAKING CHANGE, scheduled for milestone 13.0.

Fixed issues

Fixes #22091

[avaloniaui-bot]

You can test this PR using the following package version. 12.2.999-cibuild0069467-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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David M. Fritz doesn't seem to be a GitHub user.
Please add the emails used in your commits to your Github account accordingly.

[kekekeks]

Since we are trying to avoid PRs piling up for months and V13 is at least 1-2 years away, it shouldbe a // TODO13: comment.

[MrJul]

We aren't ready to accept PRs for v13 yet.
The issue is already in the milestone, so it won't be forgotten.
We'll gladly accept a PR when the time is right.

Thus, I'm closing this.