Check for IsHitTestVisible during hit tests #498
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What changed?
During the hit tests checks, the IsHitTestVisible property is ignored, only IsVisible is checked later.
This can lead to issues when a TextBox is overlayed by a TextBlock with IsHitTestVisible=false (for example in a naming control with edit and readonly states). The HitTest will detect the TextBlock in the foreground, see IsVisible = false and return. The visible
TextBox is completely ignored and the drag is executed anyway.
This PR should fix that issue.