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## Description This PR changes `ElevatedButton.icon` to avoid building a different widget. When a different widget is created the whole subtree is recreated which leads to various issues (Focus and A11y issues for instance). The change is similar to https://github.com/flutter/flutter/pull/175810 which fixed the exact same problem for `OutlinedButton.icon`. ## Related Issue [TextButton.icon breaks focus traversal and ink effect when toggling icon](https://github.com/flutter/flutter/issues/173944) [Voiceover focus traversal breaks if a button's state changes to include an icon](https://github.com/flutter/flutter/pull/175810) ## Tests - Adds 2 tests