Make CodeActionModel an idleValue (microsoft#166053)

For microsoft#164171

Author: mjbvz

src/vs/editor/contrib/codeAction/browser/codeActionCommands.ts

@@ -29,6 +29,7 @@ import { IMarkerService } from 'vs/platform/markers/common/markers';
 import { IEditorProgressService } from 'vs/platform/progress/common/progress';
 import { CodeActionModel, CodeActionsState, SUPPORTED_CODE_ACTIONS } from './codeActionModel';
 import { CodeActionAutoApply, CodeActionCommandArgs, CodeActionFilter, CodeActionItem, CodeActionKind, CodeActionSet, CodeActionTrigger, CodeActionTriggerSource } from '../common/types';
+import { IdleValue } from 'vs/base/common/async';
 
 function contextKeyForSupportedActions(kind: CodeActionKind) {
 	return ContextKeyExpr.regex(
@@ -92,7 +93,7 @@ export class CodeActionController extends Disposable implements IEditorContribut
 	}
 
 	private readonly _editor: ICodeEditor;
-	private readonly _model: CodeActionModel;
+	private readonly _model: IdleValue<CodeActionModel>;
 	private readonly _ui: Lazy<CodeActionUi>;
 
 	constructor(
@@ -106,8 +107,14 @@ export class CodeActionController extends Disposable implements IEditorContribut
 		super();
 
 		this._editor = editor;
-		this._model = this._register(new CodeActionModel(this._editor, languageFeaturesService.codeActionProvider, markerService, contextKeyService, progressService));
-		this._register(this._model.onDidChangeState(newState => this.update(newState)));
+
+		this._model = this._register(new IdleValue(() => {
+			const model = this._register(new CodeActionModel(this._editor, languageFeaturesService.codeActionProvider, markerService, contextKeyService, progressService));
+
+			this._register(model.onDidChangeState(newState => this.update(newState)));
+
+			return model;
+		}));
 
 		this._ui = new Lazy(() =>
 			this._register(_instantiationService.createInstance(CodeActionUi, editor, QuickFixAction.Id, AutoFixAction.Id, {
@@ -149,7 +156,7 @@ export class CodeActionController extends Disposable implements IEditorContribut
 	}
 
 	private _trigger(trigger: CodeActionTrigger) {
-		return this._model.trigger(trigger);
+		return this._model.value.trigger(trigger);
 	}
 
 	private _applyCodeAction(action: CodeActionItem, preview: boolean): Promise<void> {