Widget Divider not selecting proper color per docs. #190534

  /// The color to use when painting the line.
  ///
  /// If this is null, then the [DividerThemeData.color] is used. If that is
  /// also null, then [ThemeData.dividerColor] is used.

  static BorderSide createBorderSide(BuildContext? context, {Color? color, double? width}) {
    final DividerThemeData? dividerTheme = context != null ? DividerTheme.of(context) : null;
    final DividerThemeData? defaults = context != null
        ? Theme.of(context).useMaterial3
              ? _DividerDefaultsM3(context)
              : _DividerDefaultsM2(context)
        : null;
    final Color? effectiveColor = color ?? dividerTheme?.color ?? defaults?.color;
    final double effectiveWidth = width ?? dividerTheme?.thickness ?? defaults?.thickness ?? 0.0;

    // Prevent assertion since it is possible that context is null and no color
    // is specified.
    if (effectiveColor == null) {
      return BorderSide(width: effectiveWidth);
    }
    return BorderSide(color: effectiveColor, width: effectiveWidth);
  }

  @override
  Widget build(BuildContext context) {
    final ThemeData theme = Theme.of(context);
    final DividerThemeData dividerTheme = DividerTheme.of(context);
    final DividerThemeData defaults = theme.useMaterial3
        ? _DividerDefaultsM3(context)
        : _DividerDefaultsM2(context);
    final double height = this.height ?? dividerTheme.space ?? defaults.space!;
    final double thickness = this.thickness ?? dividerTheme.thickness ?? defaults.thickness!;
    final double indent = this.indent ?? dividerTheme.indent ?? defaults.indent!;
    final double endIndent = this.endIndent ?? dividerTheme.endIndent ?? defaults.endIndent!;

    return SizedBox(
      height: height,
      child: Center(
        child: Container(
          height: thickness,
          margin: EdgeInsetsDirectional.only(start: indent, end: endIndent),
          decoration: BoxDecoration(
            borderRadius: radius ?? dividerTheme.radius ?? defaults.radius,
            border: Border(
              bottom: createBorderSide(context, color: color, width: thickness),
            ),
          ),
        ),
      ),
    );
  }

class _DividerDefaultsM2 extends DividerThemeData {
  const _DividerDefaultsM2(this.context) : super(space: 16, thickness: 0, indent: 0, endIndent: 0);

  final BuildContext context;

  @override
  Color? get color => Theme.of(context).dividerColor;
}

// BEGIN GENERATED TOKEN PROPERTIES - Divider

// Do not edit by hand. The code between the "BEGIN GENERATED" and
// "END GENERATED" comments are generated from data in the Material
// Design token database by the script:
//   dev/tools/gen_defaults/bin/gen_defaults.dart.

// dart format off
class _DividerDefaultsM3 extends DividerThemeData {
  const _DividerDefaultsM3(this.context) : super(
    space: 16,
    thickness: 1.0,
    indent: 0,
    endIndent: 0,
  );

  final BuildContext context;

  @override Color? get color => Theme.of(context).colorScheme.outlineVariant;
}