Option support for `enableSuperMixins` (and more).

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index d212191070402a0b2413c742511e94f0b08e8279..7c167f942cfcada298fbb2b04d4beb993a9de241 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -22,7 +22,6 @@ import 'package:analyzer/source/pub_package_map_provider.dart';
 import 'package:analyzer/source/sdk_ext.dart';
 import 'package:analyzer/src/context/context.dart' as context;
 import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ -507,25 +506,13 @@ class ContextManagerImpl implements ContextManager {
       return;
     }
 
-    // Set strong mode (default is false).
-    bool strongMode = analyzer[AnalyzerOptions.strong_mode] ?? false;
-    AnalysisContext context = info.context;
-    if (context.analysisOptions.strongMode != strongMode) {
-      AnalysisOptionsImpl options =
-          new AnalysisOptionsImpl.from(context.analysisOptions);
-      options.strongMode = strongMode;
-      context.analysisOptions = options;
-    }
+    configureContextOptions(info.context, options);
 
     // Set ignore patterns.
     YamlList exclude = analyzer[AnalyzerOptions.exclude];
     if (exclude != null) {
       setIgnorePatternsForContext(info, exclude);
     }
-
-    // Set filters.
-    YamlNode filters = analyzer[AnalyzerOptions.errors];
-    setFiltersForContext(info, filters);
   }
 
   @override
@@ -549,26 +536,6 @@ class ContextManagerImpl implements ContextManager {
     setRoots(includedPaths, excludedPaths, packageRoots);
   }
 
-  void setFiltersForContext(ContextInfo info, YamlNode codes) {
-    List<ErrorFilter> filters = <ErrorFilter>[];
-    // If codes are enumerated, collect them as filters; else leave filters
-    // empty to overwrite previous value.
-    if (codes is YamlMap) {
-      String value;
-      codes.nodes.forEach((k, v) {
-        if (k is YamlScalar && v is YamlScalar) {
-          value = v.value?.toString()?.toLowerCase();
-          if (AnalyzerOptions.ignoreSynonyms.contains(value)) {
-            // Case-insensitive.
-            String code = k.value?.toString()?.toUpperCase();
-            filters.add((AnalysisError error) => error.errorCode.name == code);
-          }
-        }
-      });
-    }
-    info.context.setConfigurationData(CONFIGURED_ERROR_FILTERS, filters);
-  }
-
   /**
    * Sets the [ignorePatterns] for the context having info [info].
    */