Fixes #33376: push undo stops when updating the model via `IModelService.updateModel`

src/vs/editor/common/services/modelServiceImpl.ts

@@ -429,12 +429,14 @@ export class ModelServiceImpl implements IModelService {
 		}
 
 		// Otherwise find a diff between the values and update model
+		model.pushStackElement();
 		model.setEOL(textBuffer.getEOL() === '\r\n' ? EndOfLineSequence.CRLF : EndOfLineSequence.LF);
 		model.pushEditOperations(
 			[],
 			ModelServiceImpl._computeEdits(model, textBuffer),
 			(inverseEditOperations: IIdentifiedSingleEditOperation[]) => []
 		);
+		model.pushStackElement();
 	}
 
 	private static _commonPrefix(a: ILineSequence, aLen: number, aDelta: number, b: ILineSequence, bLen: number, bDelta: number): number {