hitRegionExtent property
The extent of the gesture's hit region along the resizable axis, in logical pixels.
Hit regions are centered around the dividers between resizable regions.
Defaults to 60 on Android, iOS and Fuchsia, and 10 on other platforms. To change the platform variant, update
the enclosing FTheme.platform/FAdaptiveScope.platform.
Contract
Throws AssertionError if hitRegionExtent <= 0.
Implementation
final double? hitRegionExtent;