move suppress logic, https://github.com/microsoft/vscode/issues/111878

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

@@ -19,12 +19,6 @@ export class MainThreadBulkEdits implements MainThreadBulkEditsShape {
 
 	$tryApplyWorkspaceEdit(dto: IWorkspaceEditDto, undoRedoGroupId?: number): Promise<boolean> {
 		const edits = reviveWorkspaceEditDto2(dto);
-		return this._bulkEditService.apply(edits, {
-			// having a undoRedoGroupId means that this is a nested workspace edit,
-			// e.g one from a onWill-handler and for now we need to forcefully suppress
-			// refactor previewing, see: https://github.com/microsoft/vscode/issues/111873#issuecomment-738739852
-			undoRedoGroupId,
-			suppressPreview: typeof undoRedoGroupId === 'number' ? true : undefined
-		}).then(() => true, _err => false);
+		return this._bulkEditService.apply(edits, { undoRedoGroupId }).then(() => true, _err => false);
 	}
 }

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

@@ -64,7 +64,12 @@ export class MainThreadFileSystemEventService {
 				}
 				const data = await proxy.$onWillRunFileOperation(operation, files, timeout, token);
 				const edit = reviveWorkspaceEditDto2(data);
-				await bulkEditService.apply(edit, { undoRedoGroupId });
+				await bulkEditService.apply(edit, {
+					undoRedoGroupId,
+					// this is a nested workspace edit, e.g one from a onWill-handler and for now we need to forcefully suppress
+					// refactor previewing, see: https://github.com/microsoft/vscode/issues/111873#issuecomment-738739852
+					suppressPreview: true
+				});
 			}
 		}));