Information in the progress window (example: rescan) is displayed capped to fixed size instead of contents.

<img width="209" alt="screenshot 2018-12-21 at 14 58 20" src="https://user-images.githubusercontent.com/26601261/50345943-0bbd4300-0531-11e9-9c6c-e277ac69eb0c.png">

{
    if (nProgress == 0)
    {
        progressDialog = new QProgressDialog(title, "", 0, 100);
        progressDialog->setWindowModality(Qt::ApplicationModal);
        progressDialog->setMinimumDuration(0);
        progressDialog->setAutoClose(false);
        progressDialog->setValue(0);
        progressDialog->setCancelButtonText(tr("Cancel"));
    }
    else if (nProgress == 100)
    {
        if (progressDialog)
        {
            progressDialog->close();
            progressDialog->deleteLater();
        }
    }
    else if (progressDialog) {
        if (progressDialog->wasCanceled()) {
            getWalletModel()->wallet().abortRescan();
        } else {
            progressDialog->setValue(nProgress);
        }
    }
}
void WalletView::requestedSyncWarningInfo()