Add new plugins to analysis options signature

Change-Id: Ia8600dfb33e8c65573d92b8643398488037ea63a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/393602
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>

pkg/analyzer/lib/src/dart/analysis/analysis_options.dart

@@ -283,7 +283,7 @@ class AnalysisOptionsImpl implements AnalysisOptions {
   final VersionConstraint? sourceLanguageConstraint =
       VersionConstraint.parse('>= 2.12.0');
 
-  ExperimentStatus _contextFeatures = ExperimentStatus();
+  ExperimentStatus _contextFeatures;
 
   /// The language version to use for libraries that are not in a package.
   ///
@@ -499,6 +499,20 @@ class AnalysisOptionsImpl implements AnalysisOptions {
         buffer.addString(enabledLegacyPluginName);
       }
 
+      // Append plugin configurations.
+      buffer.addInt(pluginConfigurations.length);
+      for (var pluginConfiguration in pluginConfigurations) {
+        buffer.addString(pluginConfiguration.name);
+        buffer.addBool(pluginConfiguration.isEnabled);
+        buffer.addInt(pluginConfiguration.diagnosticConfigs.length);
+        for (var diagnosticConfig
+            in pluginConfiguration.diagnosticConfigs.values) {
+          buffer.addString(diagnosticConfig.group ?? '');
+          buffer.addString(diagnosticConfig.name);
+          buffer.addBool(diagnosticConfig.isEnabled);
+        }
+      }
+
       // Hash and convert to Uint32List.
       _signature = buffer.toUint32List();
     }