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Fix #302114: Wrong default GUI font under Windows #5791

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Fix #302114: Wrong default GUI font under Windows #5791

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23 changes: 23 additions & 0 deletions mscore/preferences.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,29 @@ void Preferences::init(bool storeInMemoryOnly)
_settings = new QSettings();
}

#if defined(Q_OS_WIN)
// Use the correct default GUI font on Windows. Qt 5 and below use the deprecated function GetStockObject() with
// DEFAULT_GUI_FONT, which returns MS Shell Dlg 2 in 8 pt. MS Shell Dlg 2 is a virtual font that maps to Tahoma, which has
// not been the default Windows GUI font since 2006.
//
// The correct way to determine the default GUI font is to call SystemParametersInfoW() with SPI_GETNONCLIENTMETRICS and use
// the returned lfMessageFont structure. On all versions of Windows from Windows Vista through Windows 10, this typically
// returns Segoe UI in 9 pt.
//
// This problem is slated to be fixed in Qt 6. For details, see: https://bugreports.qt.io/browse/QTBUG-58610
//
// In the meantime, we can work around the problem by having Qt use the "QMessageBox" font instead, which is already being
// initialized the correct way.
QApplication::setFont(QApplication::font("QMessageBox"));

// If the current settings file is using the deprecated default GUI font, reset it so that the correct default font can be
// picked up automatically.
if (_settings->value(PREF_UI_THEME_FONTFAMILY) == "MS Shell Dlg 2") {
_settings->remove(PREF_UI_THEME_FONTFAMILY);
_settings->remove(PREF_UI_THEME_FONTSIZE);
}
#endif

_storeInMemoryOnly = storeInMemoryOnly;

#if defined(Q_OS_MAC) || (defined(Q_OS_WIN) && !defined(FOR_WINSTORE))
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