Update method modeling panel after changes to config

This updates the method modeling panel's view state when the
`codeQL.model.showMultipleModels` setting changes. This will ensure that
the setting updates without needing to restart VS Code since this view
is much harder to restart than the model editor.

extensions/ql-vscode/src/config.ts

@@ -711,6 +711,35 @@ const LLM_GENERATION = new Setting("llmGeneration", MODEL_SETTING);
 const EXTENSIONS_DIRECTORY = new Setting("extensionsDirectory", MODEL_SETTING);
 const SHOW_MULTIPLE_MODELS = new Setting("showMultipleModels", MODEL_SETTING);
 
+export interface ModelConfig {
+  flowGeneration: boolean;
+  llmGeneration: boolean;
+  extensionsDirectory: string | undefined;
+  showMultipleModels: boolean;
+}
+
+export class ModelConfigListener extends ConfigListener implements ModelConfig {
+  protected handleDidChangeConfiguration(e: ConfigurationChangeEvent): void {
+    this.handleDidChangeConfigurationForRelevantSettings([MODEL_SETTING], e);
+  }
+
+  public get flowGeneration(): boolean {
+    return !!FLOW_GENERATION.getValue<boolean>();
+  }
+
+  public get llmGeneration(): boolean {
+    return !!LLM_GENERATION.getValue<boolean>();
+  }
+
+  public get extensionsDirectory(): string | undefined {
+    return EXTENSIONS_DIRECTORY.getValue<string>();
+  }
+
+  public get showMultipleModels(): boolean {
+    return !!SHOW_MULTIPLE_MODELS.getValue<boolean>();
+  }
+}
+
 export function showFlowGeneration(): boolean {
   return !!FLOW_GENERATION.getValue<boolean>();
 }

extensions/ql-vscode/src/model-editor/method-modeling/method-modeling-panel.ts

@@ -5,6 +5,7 @@ import { MethodModelingViewProvider } from "./method-modeling-view-provider";
 import { Method } from "../method";
 import { ModelingStore } from "../modeling-store";
 import { ModelEditorViewTracker } from "../model-editor-view-tracker";
+import { ModelConfigListener } from "../../config";
 
 export class MethodModelingPanel extends DisposableObject {
   private readonly provider: MethodModelingViewProvider;
@@ -16,10 +17,16 @@ export class MethodModelingPanel extends DisposableObject {
   ) {
     super();
 
+    // This is here instead of in MethodModelingViewProvider because we need to
+    // dispose this when the extension gets disposed, not when the webview gets
+    // disposed.
+    const modelConfig = this.push(new ModelConfigListener());
+
     this.provider = new MethodModelingViewProvider(
       app,
       modelingStore,
       editorViewTracker,
+      modelConfig,
     );
     this.push(
       window.registerWebviewViewProvider(

extensions/ql-vscode/src/model-editor/method-modeling/method-modeling-view-provider.ts

@@ -12,7 +12,7 @@ import { DbModelingState, ModelingStore } from "../modeling-store";
 import { AbstractWebviewViewProvider } from "../../common/vscode/abstract-webview-view-provider";
 import { assertNever } from "../../common/helpers-pure";
 import { ModelEditorViewTracker } from "../model-editor-view-tracker";
-import { showMultipleModels } from "../../config";
+import { ModelConfigListener } from "../../config";
 
 export class MethodModelingViewProvider extends AbstractWebviewViewProvider<
   ToMethodModelingMessage,
@@ -26,6 +26,7 @@ export class MethodModelingViewProvider extends AbstractWebviewViewProvider<
     app: App,
     private readonly modelingStore: ModelingStore,
     private readonly editorViewTracker: ModelEditorViewTracker,
+    private readonly modelConfig: ModelConfigListener,
   ) {
     super(app, "method-modeling");
   }
@@ -33,13 +34,14 @@ export class MethodModelingViewProvider extends AbstractWebviewViewProvider<
   protected override async onWebViewLoaded(): Promise<void> {
     await Promise.all([this.setViewState(), this.setInitialState()]);
     this.registerToModelingStoreEvents();
+    this.registerToModelConfigEvents();
   }
 
   private async setViewState(): Promise<void> {
     await this.postMessage({
       t: "setMethodModelingPanelViewState",
       viewState: {
-        showMultipleModels: showMultipleModels(),
+        showMultipleModels: this.modelConfig.showMultipleModels,
       },
     });
   }
@@ -198,4 +200,12 @@ export class MethodModelingViewProvider extends AbstractWebviewViewProvider<
       }),
     );
   }
+
+  private registerToModelConfigEvents(): void {
+    this.push(
+      this.modelConfig.onDidChangeConfiguration(() => {
+        void this.setViewState();
+      }),
+    );
+  }
 }