anchor.diff:  import 'package:gallery/l10n/gallery_localizations.dart';
   import 'package:gallery/themes/material_demo_theme_data.dart';
   
  +const _docsBaseUrl = 'https://api.flutter.dev/flutter';
  +
   class GalleryDemo {
     GalleryDemo({
       @required this.title,
  
positive.code:       ],
      ),
      GalleryDemo(
        title: GalleryLocalizations.of(context).demoSlidersTitle,
        icon: GalleryIcons.sliders,
        subtitle: GalleryLocalizations.of(context).demoSlidersSubtitle,
        configurations: [
          GalleryDemoConfiguration(
            title: GalleryLocalizations.of(context).demoSlidersTitle,
            description: GalleryLocalizations.of(context).demoSlidersDescription,
            documentationUrl:
                'https://api.flutter.dev/flutter/material/Slider-class.html',
            buildRoute: (context) => SlidersDemo(type: SlidersDemoType.sliders),
            code: CodeSegments.slidersDemo,
          ),
          GalleryDemoConfiguration(
            title: GalleryLocalizations.of(context).demoRangeSlidersTitle,
            description:
                GalleryLocalizations.of(context).demoRangeSlidersDescription,
            documentationUrl:
                'https://api.flutter.dev/flutter/material/RangeSlider-class.html',
            buildRoute: (context) =>
                SlidersDemo(type: SlidersDemoType.rangeSliders),
            code: CodeSegments.rangeSlidersDemo,
          ),
          GalleryDemoConfiguration(
            title: GalleryLocalizations.of(context).demoCustomSlidersTitle,
            description:
                GalleryLocalizations.of(context).demoCustomSlidersDescription,
            documentationUrl:
                'https://api.flutter.dev/flutter/material/SliderTheme-class.html',
            buildRoute: (context) =>
                SlidersDemo(type: SlidersDemoType.customSliders),
            code: CodeSegments.customSlidersDemo,
  
negative.code:       ],
      ),
      GalleryDemo(
        title: localizations.demoProgressIndicatorTitle,
        icon: GalleryIcons.progressActivity,
        subtitle: localizations.demoProgressIndicatorSubtitle,
        configurations: [
          GalleryDemoConfiguration(
            title: localizations.demoCircularProgressIndicatorTitle,
            description: localizations.demoCircularProgressIndicatorDescription,
            documentationUrl:
                '$_docsBaseUrl/material/CircularProgressIndicator-class.html',
            buildRoute: (context) => ProgressIndicatorDemo(
              type: ProgressIndicatorDemoType.circular,
            ),
            code: CodeSegments.progressIndicatorsDemo,
          ),
          GalleryDemoConfiguration(
            title: localizations.demoLinearProgressIndicatorTitle,
            description: localizations.demoLinearProgressIndicatorDescription,
            documentationUrl:
                '$_docsBaseUrl/material/LinearProgressIndicator-class.html',
            buildRoute: (context) => ProgressIndicatorDemo(
              type: ProgressIndicatorDemoType.linear,
            ),
  