Make pointSize set the pixel size

Make the function `pointSize` set the font size in pixels. This works if the intended model is that users use global fractional scaling. In that case pixel sized fonts are also scaled so that they should stay legible for different screen sizes and pixel densities.

include/gui_templates.h

@@ -32,28 +32,16 @@
 #include <QFont>
 #include <QGuiApplication>
 
-// TODO: remove once qt5 support is dropped
-#if (QT_VERSION < QT_VERSION_CHECK(6,0,0))
-	#include <QScreen>
-#endif
-
 namespace lmms::gui
 {
 
-
-// return DPI-independent font-size - font with returned font-size has always
-// the same size in pixels
-inline QFont pointSize(QFont fontPointer, float fontSize)
+// Convenience method to set the font size in pixels
+inline QFont pointSize(QFont fontPointer, int fontSize)
 {
-	// to calculate DPI of a screen to make it HiDPI ready
-	qreal devicePixelRatio = QGuiApplication::primaryScreen()->devicePixelRatio();
-    qreal scaleFactor = std::max(devicePixelRatio, 1.0); // Ensure scaleFactor is at least 1.0
-
-	fontPointer.setPointSizeF(fontSize * scaleFactor);
+	fontPointer.setPixelSize(fontSize);
 	return fontPointer;
 }
 
-
 } // namespace lmms::gui
 
 #endif // LMMS_GUI_TEMPLATES_H