qt: Fix font family updates (dashpay#3746)

* qt: Update the application font if the font family gets changed

* qt: Make sure recent transactions have the correct font family

Introduced because QListView is ignored in GUIUtil::updateFonts, so its base font family doesn't change, hence the recent transactions don't adjust because the painter's font doesn't change.

* Store initial font size

Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>

src/qt/guiutil.cpp

@@ -1274,6 +1274,7 @@ QString fontFamilyToString(FontFamily family)
 void setFontFamily(FontFamily family)
 {
     fontFamily = family;
+    setApplicationFont();
     updateFonts();
 }
 

src/qt/overviewpage.cpp

@@ -54,7 +54,7 @@ class TxViewDelegate : public QAbstractItemDelegate
         QRect rectBottomHalf(mainRect.left() + xspace, mainRect.top() + ypad + halfheight + 5, mainRect.width() - xspace, halfheight);
         QRect rectBounding;
         QColor colorForeground;
-        QFont fontInitial = painter->font();
+        qreal initialFontSize = painter->font().pointSizeF();
 
         // Grab model indexes for desired data from TransactionTableModel
         QModelIndex indexDate = index.sibling(index.row(), TransactionTableModel::Date);
@@ -63,9 +63,7 @@ class TxViewDelegate : public QAbstractItemDelegate
 
         // Draw first line (with slightly bigger font than the second line will get)
         // Content: Date/Time, Optional IS indicator, Amount
-        QFont font = fontInitial;
-        font.setPointSizeF(GUIUtil::getScaledFontSize(font.pointSizeF() * 1.17));
-        painter->setFont(font);
+        painter->setFont(GUIUtil::getFont(GUIUtil::FontWeight::Normal, false, GUIUtil::getScaledFontSize(initialFontSize * 1.17)));
         // Date/Time
         colorForeground = qvariant_cast<QColor>(indexDate.data(Qt::ForegroundRole));
         QString strDate = indexDate.data(Qt::DisplayRole).toString();
@@ -85,8 +83,7 @@ class TxViewDelegate : public QAbstractItemDelegate
 
         // Draw second line (with the initial font)
         // Content: Address/label, Optional Watchonly indicator
-        fontInitial.setPointSizeF(GUIUtil::getScaledFontSize(fontInitial.pointSizeF()));
-        painter->setFont(fontInitial);
+        painter->setFont(GUIUtil::getFont(GUIUtil::FontWeight::Normal, false, GUIUtil::getScaledFontSize(initialFontSize)));
         // Address/Label
         colorForeground = qvariant_cast<QColor>(indexAddress.data(Qt::ForegroundRole));
         QString address = indexAddress.data(Qt::DisplayRole).toString();