Invalidate brush when transform changed event is fired #15098
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What does the pull request do?
Brushes will be invalidated when their bound Transforms fire a Changed event.
What is the current behavior?
Brushes are not invalidated when their bound Transform is changed (not the property, but the inner matrix).
What is the updated/expected behavior with this PR?
Changes to bound transform will cause the brush to invalidate and redraw.
How was the solution implemented (if it's not obvious)?
Checklist
Breaking changes
n/a
Obsoletions / Deprecations
n/a
Fixed issues
Fixes #15097