Enable high DPI scaling on Qt >= 5.6

spyderlib/app/spyder.py

@@ -76,7 +76,7 @@
 from qtpy import API, PYQT5
 from qtpy.compat import from_qvariant, getopenfilename, getsavefilename
 from qtpy.QtCore import (QByteArray, QCoreApplication, QPoint, QSize, Qt,
-                         QThread, QTimer, QUrl, Signal, Slot)
+                         QThread, QTimer, QUrl, Signal, Slot, QT_VERSION)
 from qtpy.QtGui import QColor, QDesktopServices, QKeySequence, QPixmap
 from qtpy.QtWidgets import (QAction, QApplication, QDockWidget, QMainWindow,
                             QMenu, QMessageBox, QShortcut, QSplashScreen,
@@ -90,6 +90,12 @@
 # Avoid a bug in Qt: https://bugreports.qt.io/browse/QTBUG-46720
 from qtpy import QtWebEngineWidgets  # analysis:ignore
 
+#==============================================================================
+# Proper high DPI scaling is available in Qt >= 5.6.0. This attibute must
+# be set before creating the application
+#==============================================================================
+if QT_VERSION >= 0x050600:
+    QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling, True)
 
 #==============================================================================
 # Create our QApplication instance here because it's needed to render the