Steps to Reproduce

1. Open DataTable documentation and look at sample https://api.flutter.dev/flutter/material/DataTable-class.html
2. Change 'Age' column on row 37 to 'Age longer'
3. Reduce browser width to see overflow on column header

Expected results:
With column headings shorter than row content, there is no overflow error no matter how small you squeeze the table. Expect no overflow with longer headings too.

Actual results:
Overflow error with longer headings

This happens on the current Dart/Flutter versions deployed on the api.flutter.dev site.

Here are some videos illustrating the problem. The first video shows the sample unmodified:

The second video shows the overflow when you change 'Age' to 'Age longer'.