Return the configured font for data browser in the model

Otherwise it cannot be used by the format toolbar to get the cell font when
the default has not been overwritten.

See comment in issue #1976

# Conflicts:
#	src/TableBrowser.cpp

src/TableBrowser.cpp

@@ -212,8 +212,11 @@ TableBrowser::TableBrowser(QWidget* parent) :
 
     connect(ui->dataTable, &ExtendedTableWidget::currentIndexChanged, this, [this](const QModelIndex &current, const QModelIndex &) {
             // Get cell current format for updating the format toolbar values. Block signals, so the format change is not reapplied.
+            QString font_string = m_model->data(current, Qt::FontRole).toString();
             QFont font;
-            font.fromString(m_model->data(current, Qt::FontRole).toString());
+            if(!font_string.isEmpty())
+                font.fromString(font_string);
+
             ui->fontComboBox->blockSignals(true);
             ui->fontComboBox->setCurrentFont(font);
             ui->fontComboBox->blockSignals(false);

src/sqlitetablemodel.cpp

@@ -353,7 +353,7 @@ QVariant SqliteTableModel::data(const QModelIndex &index, int role) const
             return QVariant();
         return decode(data);
     } else if(role == Qt::FontRole) {
-        QFont font;
+        QFont font = m_font;
         if(!row_available || data.isNull() || isBinary(data))
             font.setItalic(true);
         else {
@@ -1175,6 +1175,8 @@ void SqliteTableModel::reloadSettings()
     m_nullBgColour = QColor(Settings::getValue("databrowser", "null_bg_colour").toString());
     m_binFgColour = QColor(Settings::getValue("databrowser", "bin_fg_colour").toString());
     m_binBgColour = QColor(Settings::getValue("databrowser", "bin_bg_colour").toString());
+    m_font = QFont(Settings::getValue("databrowser", "font").toString());
+    m_font.setPointSize(Settings::getValue("databrowser", "fontsize").toInt());
     m_symbolLimit = Settings::getValue("databrowser", "symbol_limit").toInt();
     m_imagePreviewEnabled = Settings::getValue("databrowser", "image_preview").toBool();
     m_chunkSize = static_cast<std::size_t>(Settings::getValue("db", "prefetchsize").toUInt());

src/sqlitetablemodel.h

@@ -3,6 +3,7 @@
 
 #include <QAbstractTableModel>
 #include <QColor>
+#include <QFont>
 
 #include <map>
 #include <memory>
@@ -235,6 +236,7 @@ public slots:
     QColor m_nullBgColour;
     QColor m_binFgColour;
     QColor m_binBgColour;
+    QFont m_font;
     int m_symbolLimit;
     bool m_imagePreviewEnabled;