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">

#ifndef BITCOIN_QT_GUIUTIL_H
#define BITCOIN_QT_GUIUTIL_H
#include <amount.h>
#include <fs.h>
#include <QEvent>
#include <QHeaderView>
#include <QItemDelegate>
#include <QMessageBox>
#include <QObject>
#include <QProgressBar>
#include <QString>
#include <QTableView>
#include <QLabel>
class QValidatedLineEdit;