propose CompletionList#isDetailsResolved, #39441

src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts

@@ -367,6 +367,7 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 					return {
 						suggestions: result.b.map(d => MainThreadLanguageFeatures._inflateSuggestDto(result.a, d)),
 						incomplete: result.c,
+						isDetailsResolved: result.d,
 						dispose: () => typeof result.x === 'number' && this._proxy.$releaseCompletionItems(handle, result.x)
 					};
 				});