Make sure style sample column is not editable directly.

Author: t-paul

src/gui/FontList.cc

@@ -53,6 +53,11 @@ void FontItemDelegate::initStyleOption(QStyleOptionViewItem *opt, const QModelIn
   opt->textElideMode = Qt::ElideNone;
 }
 
+QWidget *FontItemDelegate::createEditor(QWidget *, const QStyleOptionViewItem &, const QModelIndex &) const
+{
+  return nullptr;
+}
+
 QSize FontItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &idx) const
 {
   QStyleOptionViewItem opt = option;

src/gui/FontList.h

@@ -25,6 +25,7 @@ class FontItemDelegate : public QStyledItemDelegate
 
 protected:
   void initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const override;
+  QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
 
 private:
   int _fontSize;