2024 Solution

1. Wrap IconButton with SizedBox
2. Set IconButton's padding to EdgeInsets.all(0)

Code Below:

SizedBox(
  height: 30,
  width: 30,
  child: IconButton(
    padding: const EdgeInsets.all(0),
    onPressed: () {},
    icon: Icon(
      Icons.info_outline,
      size: 26
    )
  ),
),