Fix checkbox error (#653)

* Fix checkbox error

* Prepare Forui for review

* Update changelog

* Update forui/CHANGELOG.md

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Pante <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: Pante

forui/CHANGELOG.md

@@ -159,6 +159,7 @@ We've done an overhaul of `FSelect` to make it more consistent and easier to use
 
 * Fix `FProgress.circularIcon()` using incorrect color.
 * Fix `FScaffold` not propagating `IconTheme` from `FStyle.iconStyle`.
+* Fix `FSelectGroup` throwing a duplicate error when rapidly hovering over several `FCheckbox`es. 
 * Fix `FTabs` throwing an assertion error if `FTabController` is provided with a `initialIndex` > 0.
 
 

forui/lib/src/widgets/checkbox.dart

@@ -135,6 +135,8 @@ class FCheckbox extends StatelessWidget {
             child: AnimatedSwitcher(
               duration: style.animationDuration,
               switchInCurve: style.curve,
+              // This transition builder is necessary because of https://github.com/flutter/flutter/issues/121336#issuecomment-1482620874
+              transitionBuilder: (child, opacity) => FadeTransition(opacity: opacity, child: child),
               child: SizedBox.square(
                 key: SetKey(states),
                 dimension: style.size,