High DPI autoscaling
====================
UseHighDpiPixmaps
QLineEdit::sizeHint fm.height()= 14 vertM 2 in 106 16
QWindowsXPStyle::sizeFromContents sz (in) QSize(106, 16) true
QWindowsXPStyle::sizeFromContents QMargins(1, 1, 1, 1)
QWindowsXPStyle::sizeFromContents sz= (out) QSize(131, 16)
QLineEdit::sizeHint out QSize(131, 16)
"5.6.1 windows windowsvista" () 
 108 , 108 dpi dpr= 2
 
High DPI no scaling
====================

DisableHighDpiScaling
UseHighDpiPixmaps
QLineEdit::sizeHint fm.height()= 29 vertM 2 in 208 31
QWindowsXPStyle::sizeFromContents sz (in) QSize(208, 31) true
QWindowsXPStyle::sizeFromContents QMargins(3, 3, 3, 3)
QWindowsXPStyle::sizeFromContents sz= (out) QSize(256, 35)
QLineEdit::sizeHint out QSize(256, 35)
"5.6.1 windows windowsvista" ("-n") 
 216 , 216 dpi dpr= 1
 
Normal monitor
==============

UseHighDpiPixmaps
QLineEdit::sizeHint fm.height()= 13 vertM 2 in 106 16
QWindowsXPStyle::sizeFromContents sz (in) QSize(106, 16) true
QWindowsXPStyle::sizeFromContents QMargins(3, 3, 3, 3)
QWindowsXPStyle::sizeFromContents sz= (out) QSize(133, 20)
QLineEdit::sizeHint out QSize(133, 20)
"5.6.1 windows windowsvista" () 
 96 , 96 dpi dpr= 1