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">

QPushButton *exportButton = new QPushButton(tr("&Export"), this);
    exportButton->setToolTip(tr("Export the data in the current tab to a file"));
    if (platformStyle->getImagesOnButtons()) {
        exportButton->setIcon(platformStyle->SingleColorIcon(":/icons/export"));
    }
    hbox_buttons->addStretch();
    hbox_buttons->addWidget(exportButton);
    vbox->addLayout(hbox_buttons);
    transactionsPage->setLayout(vbox);
    receiveCoinsPage = new ReceiveCoinsDialog(platformStyle);
    sendCoinsPage = new SendCoinsDialog(platformStyle);
    usedSendingAddressesPage = new AddressBookPage(platformStyle, AddressBookPage::ForEditing, AddressBookPage::SendingTab, this);
    usedReceivingAddressesPage = new AddressBookPage(platformStyle, AddressBookPage::ForEditing, AddressBookPage::ReceivingTab, this);
    addWidget(overviewPage);
    addWidget(transactionsPage);
    addWidget(receiveCoinsPage);
    addWidget(sendCoinsPage);
    
    connect(overviewPage, &OverviewPage::transactionClicked, transactionView, static_cast<void (TransactionView::*)(const QModelIndex&)>(&TransactionView::focusTransaction));
    connect(overviewPage, &OverviewPage::outOfSyncWarningClicked, this, &WalletView::requestedSyncWarningInfo);
    
    connect(sendCoinsPage, &SendCoinsDialog::coinsSent, transactionView, static_cast<void (TransactionView::*)(const uint256&)>(&TransactionView::focusTransaction));
    
    connect(exportButton, &QPushButton::clicked, transactionView, &TransactionView::exportClicked);
    
    connect(sendCoinsPage, &SendCoinsDialog::message, this, &WalletView::message);
    
    connect(transactionView, &TransactionView::message, this, &WalletView::message);
}
WalletView::~WalletView()