Qt 5.8.0 installer doesn't render well on high dpi Microsoft Surface Book

Qt 5.8.0 installer doesn't render well on high dpi Microsoft Surface Book
Description The Microsoft Surface Book has a high resolution 3000x2000 display and to make the screen readable, it has "the size of text, apps and other items" set to "200% (Recommended)". When running the Qt5.8.0 installer the initial window size is too small, causing components to appear cramped, and, sometimes cropping the text.

The workarounds are:

1. Resize the installer on every run
2. Set QT_AUTO_SCREEN_SCALE_FACTOR=1 prior to running the installer

On a related note, our own application's installers built using the Qt Installer Framework are similarly affected. I recommend adding QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling); to installers. If making changes to the Qt Installer Framework, please ensure the maintenancetool is updated as well.