_RenderLayoutBuilderPreserveBaseline receives infinite constraints when rendering LaTeX with \frac and \sqrt #120
Description
When rendering certain LaTeX formulas that include both \frac and \sqrt inside a layout with unbounded constraints (e.g., inside a Column or ListView without size limits), the widget throws an exception during layout:
_RenderLayoutBuilderPreserveBaseline object was given an infinite size during layout.
The exact size it was given was: Size(Infinity, Infinity)
The issue seems to originate from the LayoutBuilderPreserveBaseline in
lib/src/ast/nodes/sqrt.dart:68 and also occurs with fractions rendered via _FracPos.
This happens because the widget is given unconstrained height and width from its parent layout, which causes the render object to fail when calculating size.
import 'package:flutter/material.dart';
import 'package:flutter_math_fork/flutter_math.dart';
class TestMathError extends StatelessWidget {
@OverRide
Widget build(BuildContext context) {
return Scaffold(
body: Column( // Unbounded height for children
children: [
Math.tex(r"\frac{1}{2} + \sqrt{21}"),
],
),
);
}
}
Expected behavior:
The widget should either:
Render the formula without throwing, by constraining itself to the available space, or
Throw a more informative error suggesting a wrapper (e.g., SizedBox, ConstrainedBox).
Actual behavior:
It throws during performLayout because it receives Size(Infinity, Infinity).