Search field inputs are not aligned

The hint/input text in the DevTools search widget is not centered vertically:

Not sure if this is a DevTools or Framework regression, more investigation is needed. It looks like the vertical padding of the `RepaintBoundary` drawn by the framework is not equal:


Start by reproducing the misaligned hint/input text in the DevTools search widget and compare it with the attached screenshots. Trace whether the unequal vertical padding comes from DevTools or the Flutter framework's RepaintBoundary; done means the search text is vertically centered.

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