🐛 Text alignment in TextBox depends on placeholder

[robkri]

The alignment of the text inside a TextBox changes depending on whether or not the TextBox is given a placeholder text. If any String is passed to placeholder (even an empty String), the text gets aligned vertically centered. Otherwise it's aligned at the top of the TextBox. This is barely recognizable in the first two examples where the difference is only about 1px, but shows very clearly when TextBox expands in a larger parent:

To reproduce

Column(
      children: [
        SizedBox(child: TextBox()),
        SizedBox(height: 16),
        SizedBox(child: TextBox(placeholder: "")),
        SizedBox(height: 16),
        SizedBox(height: 50, child: TextBox()),
        SizedBox(height: 16),
        SizedBox(height: 50, child: TextBox(placeholder: "")),
      ],
    )

Expected behaviour
The text inside a TextBox with maxLines = 1 is always vertically centered.