Update the URL to the recommend bug report (#23708)

We have templates now.

bin/internal/update_dart_sdk.sh

@@ -64,7 +64,7 @@ if [ ! -f "$ENGINE_STAMP" ] || [ "$ENGINE_VERSION" != `cat "$ENGINE_STAMP"` ]; t
     echo
     echo "It appears that the downloaded file is corrupt; please try the operation again later."
     echo "If this problem persists, please report the problem at"
-    echo "https://github.com/flutter/flutter/issues/new"
+    echo "https://github.com/flutter/flutter/issues/new?template=ACTIVATION.md"
     echo
     rm -f -- "$DART_SDK_ZIP"
     exit 1

examples/flutter_gallery/lib/gallery/app.dart

@@ -114,7 +114,7 @@ class _GalleryAppState extends State<GalleryApp> {
         options: _options,
         onOptionsChanged: _handleOptionsChanged,
         onSendFeedback: widget.onSendFeedback ?? () {
-          launch('https://github.com/flutter/flutter/issues/new', forceSafariVC: false);
+          launch('https://github.com/flutter/flutter/issues/new/choose', forceSafariVC: false);
         },
       ),
     );

packages/flutter/lib/src/foundation/assertions.dart

@@ -314,7 +314,7 @@ class FlutterError extends AssertionError {
                      'provide substantially more information in this error message to help you determine '
                      'and fix the underlying cause.', wrapWidth: wrapWidth);
           debugPrint('In either case, please report this assertion by filing a bug on GitHub:', wrapWidth: wrapWidth);
-          debugPrint('  https://github.com/flutter/flutter/issues/new');
+          debugPrint('  https://github.com/flutter/flutter/issues/new?template=BUG.md');
         }
       }
       if (details.stack != null) {

packages/flutter/lib/src/rendering/box.dart

@@ -1766,7 +1766,7 @@ abstract class RenderBox extends RenderObject {
           'Constraints: $constraints\n'
           'Size: $_size\n'
           'If you are not writing your own RenderBox subclass, then this is not '
-          'your fault. Contact support: https://github.com/flutter/flutter/issues/new'
+          'your fault. Contact support: https://github.com/flutter/flutter/issues/new?template=BUG.md'
         );
       }
       if (debugCheckIntrinsicSizes) {
@@ -1815,7 +1815,7 @@ abstract class RenderBox extends RenderObject {
             'The following ${failureCount > 1 ? "failures" : "failure"} was detected:\n'
             '$failures'
             'If you are not writing your own RenderBox subclass, then this is not\n'
-            'your fault. Contact support: https://github.com/flutter/flutter/issues/new'
+            'your fault. Contact support: https://github.com/flutter/flutter/issues/new?template=BUG.md'
           );
         }
       }

packages/flutter/lib/src/rendering/flex.dart

@@ -707,7 +707,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
             '  https://flutter.io/debugging/#rendering-layer\n'
             '  http://docs.flutter.io/flutter/rendering/debugDumpRenderTree.html\n'
             'If none of the above helps enough to fix this problem, please don\'t hesitate to file a bug:\n'
-            '  https://github.com/flutter/flutter/issues/new'
+            '  https://github.com/flutter/flutter/issues/new?template=BUG.md'
           );
         }());
         totalFlex += childParentData.flex;

packages/flutter/lib/src/widgets/framework.dart

@@ -2135,7 +2135,7 @@ class BuildOwner {
           'calling scheduleBuildFor().\n'
           'If you did not attempt to call scheduleBuildFor() yourself, then this probably '
           'indicates a bug in the widgets framework. Please report it: '
-          'https://github.com/flutter/flutter/issues/new'
+          'https://github.com/flutter/flutter/issues/new?template=BUG.md'
         );
       }
       return true;

packages/flutter/test/foundation/error_reporting_test.dart

@@ -71,7 +71,7 @@ Future<void> main() async {
       'Either the assertion indicates an error in the framework itself, or we should provide substantially '
       'more information in this error message to help you determine and fix the underlying cause\\.\n'
       'In either case, please report this assertion by filing a bug on GitHub:\n'
-      '  https://github\\.com/flutter/flutter/issues/new\n'
+      '  https://github\\.com/flutter/flutter/issues/new\\?template=BUG\\.md\n'
       '\n'
       'When the exception was thrown, this was the stack:\n'
       '#0      getSampleStack\\.<anonymous closure> \\([^)]+flutter/test/foundation/error_reporting_test\\.dart:[0-9]+:[0-9]+\\)\n'
@@ -112,7 +112,7 @@ Future<void> main() async {
       'Either the assertion indicates an error in the framework itself, or we should provide substantially '
       'more information in this error message to help you determine and fix the underlying cause\\.\n'
       'In either case, please report this assertion by filing a bug on GitHub:\n'
-      '  https://github\\.com/flutter/flutter/issues/new\n'
+      '  https://github\\.com/flutter/flutter/issues/new\\?template=BUG\\.md\n'
       '════════════════════════════════════════════════════════════════════════════════════════════════════\$',
     ));
     console.clear();
@@ -152,7 +152,7 @@ Future<void> main() async {
       'Either the assertion indicates an error in the framework itself, or we should provide substantially '
       'more information in this error message to help you determine and fix the underlying cause\\.\n'
       'In either case, please report this assertion by filing a bug on GitHub:\n'
-      '  https://github\\.com/flutter/flutter/issues/new\n'
+      '  https://github\\.com/flutter/flutter/issues/new\\?template=BUG\\.md\n'
       '\n'
       'When the exception was thrown, this was the stack:\n'
       '#0      getSampleStack\\.<anonymous closure> \\([^)]+flutter/test/foundation/error_reporting_test\\.dart:[0-9]+:[0-9]+\\)\n'

packages/flutter_localizations/lib/src/l10n/README.md

@@ -184,7 +184,7 @@ translations for all the languages supported by this package.
 (Googlers, for more details see <go/flutter-l10n>.)
 
 If you have feedback about the translations please
-[file an issue on the Flutter github repo](https://github.com/flutter/flutter/issues/new).
+[file an issue on the Flutter github repo](https://github.com/flutter/flutter/issues/new?template=BUG.md).
 
 
 ### See Also

packages/flutter_tools/lib/src/android/android_device.dart

@@ -633,7 +633,7 @@ void parseADBDeviceOutput(String text, {
       diagnostics?.add(
         'Unexpected failure parsing device information from adb output:\n'
         '$line\n'
-        'Please report a bug at https://github.com/flutter/flutter/issues/new');
+        'Please report a bug at https://github.com/flutter/flutter/issues/new/choose');
     }
   }
 }