Diff Algorithm bug

[repro.json](https://github.com/user-attachments/files/31687368/repro.json)

```
private static computeDiff(originalTextModel: ICommonModel | ITextModel, modifiedTextModel: ICommonModel | ITextModel, options: IDocumentDiffProviderOptions, diffAlgorithm: ILinesDiffComputer): IDiffComputationResult {

const originalLines = originalTextModel.getLinesContent();
const modifiedLines = modifiedTextModel.getLinesContent();

const result = diffAlgorithm.computeDiff(originalLines, modifiedLines, options);

const identical = (result.changes.length > 0 ? false : this._modelsAreIdentical(originalTextModel, modifiedTextModel));

```

fails in "computeDiff", using wasm diff computer.