Search: Adjust spacing to be more like previous version

After recent changes, the results take a lot more space compared to the
previous version.

addons/search/htmldelegate.cpp

@@ -188,3 +188,12 @@ void SPHtmlDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option
         painter->restore();
     }
 }
+
+QSize SPHtmlDelegate::sizeHint(const QStyleOptionViewItem &opt, const QModelIndex &index) const
+{
+    QSize s = QStyledItemDelegate::sizeHint(opt, index);
+    QFontMetrics fm(m_font);
+    s.setHeight(fm.lineSpacing());
+    s = s.grownBy({0, 2, 0, 2});
+    return s;
+}

addons/search/htmldelegate.h

@@ -18,6 +18,7 @@ public:
     explicit SPHtmlDelegate(QObject *parent);
 
     void paint(QPainter *, const QStyleOptionViewItem &, const QModelIndex &) const override;
+    QSize sizeHint(const QStyleOptionViewItem &, const QModelIndex &) const override;
 
 private:
     void paintMatchItem(QPainter *, const QStyleOptionViewItem &, const QModelIndex &index) const;