accessibility

Replace the deprecated textScaleFactor on MediaQueryData, Text, RichText and TextPainter with TextScaler. What dart fix rewrites (3 of 9 call sites in our sample), why its output can quietly undo Android 14 nonlinear font scaling, how to cap text size with clamp and withClampedTextScaling, and the equality and test gotchas. Measured on Flutter 3.44.8 with Dart 3.12.2.

Flutter web 3.41 to 3.44 reports a ~625x line-height override when an Android WebView's textZoom is not 100. Upgrade to 3.47, or clear the override in MaterialApp.builder.

Radio.groupValue and Radio.onChanged were deprecated after Flutter 3.32 and RadioGroup shipped in 3.35. A step-by-step migration for Radio, RadioListTile and CupertinoRadio, why dart fix cannot do it for you, and the generic type-inference trap that silently renders a migrated radio disabled. Verified on Flutter 3.44.2 stable.