Qt6 port:

* Constructor of QFontDatabase is deprecated, use static functions instead
* Fix QuantitySpinBox::selectNumber()
* Fix InputField::selectNumber()
* Make InputField::fixup() compatible with Qt6
* QFont::setWeight requires an enum now
* QInputEvent reuires a pointing device now
* QAbstractItemView::viewOptions() has been renamed to QAbstractItemView::initViewItemOption()

src/Gui/DlgEditorImp.cpp

@@ -247,8 +247,11 @@ void DlgSettingsEditorImp::loadSettings()
 
     QByteArray fontName = this->font().family().toLatin1();
 
-    QFontDatabase fdb;
-    QStringList familyNames = fdb.families( QFontDatabase::Any );
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
+    QStringList familyNames = QFontDatabase().families(QFontDatabase::Any);
+#else
+    QStringList familyNames = QFontDatabase::families(QFontDatabase::Any);
+#endif
     ui->fontFamily->addItems(familyNames);
     int index = familyNames.indexOf(QString::fromLatin1(hGrp->GetASCII("Font", fontName).c_str()));
     if (index < 0) index = 0;