Ryken100/attached card shadow composition mask brush resize fix

[Ryken100]

Fixes #4587

This PR fixes an issue where when AttachedCardShadow.InnerContentClipType is set to CompositionMaskBrush, the shadow doesn't properly resize when the element it's attached to changes size. It also fixes an issue where if InnerContentClipType is set to CompositionMaskBrush then back to CompositionGeometricClip, resizing gets broken in the CompositionGeometricClip mode as well.

PR Type

What kind of change does this PR introduce?

Bugfix

What is the current behavior?

When AttachedCardShadow.InnerContentClipType == CompositionMaskBrush, the sizes of the masked SpriteVisual, and the SpriteVisual that owns the shadow were not updated when the attached FrameworkElement changes size. Additionally, AttachedShadowElementContext.SpriteVisual.Size and RelativeSizeAdjustment values were not reset to default when InnerContentClipType changed from CompositionMaskBrush to CompositionGeometricClip.

What is the new behavior?

When AttachedCardShadow.InnerContentClipType == CompositionMaskBrush, the sizes of the masked SpriteVisual, and the SpriteVisual are now updated when the attached FrameworkElement changes size. Additionally, AttachedShadowElementContext.SpriteVisual.Size and RelativeSizeAdjustment are reset to default when AttachedCardShadow.InnerContentClipType == CompositionGeometricClip, preventing potential resize issues.

PR Checklist

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tested code with current supported SDKs
• Contains NO breaking changes

Other information

[ghost]

Thanks Ryken100 for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

[michael-hawker]

Tested in the sample app, worked like a charm!