dividerHeight property
final
The height of the divider.
If the dividerHeight is zero or negative, then the divider will not be drawn.
If null and ThemeData.useMaterial3 is true, TabBarTheme.dividerHeight is used. If that is also null and ThemeData.useMaterial3 is true, 1.0 will be used. Otherwise divider will not be drawn.
Implementation
final double? dividerHeight;