@NotNull
    private String getBaseContent() throws VcsException {
      return ReadAction.compute(() -> {
        VirtualFile file = myBeforeFilePath.getVirtualFile();
        if (file == null) throw new VcsException(VcsBundle.message("patch.apply.error.file.not.found", myBeforeFilePath));
        final Document doc = FileDocumentManager.getInstance().getDocument(file);
        if (doc == null) throw new VcsException(VcsBundle.message("patch.apply.error.document.not.found", file));
        return doc.getText();
      });
    }
@NotNull
    private String getBaseContent()