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22a2203888
Fixes #172489 When an OutlinedButton.icon is initially built with a null icon and later updated to display an icon, the underlying widget implementation changes. The button switches from a standard OutlinedButton to a private _OutlinedButtonWithIcon widget. This switch causes the button's entire semantic node to be destroyed and a new one created in its place. For screen readers like VoiceOver, this behavior is disruptive. If an accessibility service is focused on the button when its icon appears, that focus is lost because the original semantic node is discarded, leading to strange behaviour as it makes an best effort to focus on an existing node. This PR resolves the issue by ensuring the same widget is used regardless of whether the icon is present. The logic for _OutlinedButtonWithIcon has been merged into the base class OutlinedButton, ensuring that no matter if you call OutlinedButton.icon or OutlinedButton you recieve a widget of type OutlinedButton. Demo: https://github.com/user-attachments/assets/e012bac9-823e-46f1-8eba-ec70e6b260a1
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