fitted_box_with_siblings changelog

2.0.0 #

BREAKING: Replaced the computeRects callback with a delegate of type FittedBoxWithSiblingsDelegate, which has a computeRects method and a shouldRelayout method. Rebuilding with an equivalent delegate (same runtimeType, shouldRelayout returns false) no longer triggers an unnecessary relayout on every rebuild. To migrate, move your callback body into a delegate subclass:
```
class MyDelegate extends FittedBoxWithSiblingsDelegate {
  const MyDelegate();

  @override
  List<Rect> computeRects(BoxConstraints constraints, Size boxSize) => [...];

  @override
  bool shouldRelayout(MyDelegate oldDelegate) => false;
}
```
Fix: clipBehavior now clips siblings (and the fitted child's destination) that extend outside the widget's bounds, not just fit-cropped content.
Fix: computeRects returning an empty list or too many rects now reports a single descriptive FlutterError (previously an internal ArgumentError or silent acceptance); too few rects no longer cascades secondary exceptions, and dry layout reports the same error as real layout.
Fix: the dry baseline now matches the actual baseline (it previously used Stack-style positioning logic that ignored the computed rects).
Docs: corrected the stackFit documentation (it transforms the constraints passed to computeRects; the first child is always laid out unconstrained) and documented the intrinsic-dimensions approximation.

Initial release.
FittedBoxWithSiblings widget that scales a first child like FittedBox while positioning sibling widgets at computed rects.
computeRects callback receives constraints and the first child's natural size, returns a List<Rect> for all children.
Supports BoxFit, Alignment, StackFit, and Clip properties.
Fix: siblings are now painted and hit-tested even when the fitted child has an empty size.
Fix: render object default alignment matches widget default (Alignment.center).