Add high-dpi auto test

Use the new screen config feature of the offscreen
platform plugin to run tests on virtual screen setup.

This has the benefit that we can auto-test the QHighDpiScaling
implementation (as well as its usage in QtGui) on any platform
with a fixed mock screen setup which does not rely on physical
screen configuration.

Test the following configurations:
   - three screens: 96 DPI. (reference)
   - three screens: 192 DPI
   - three screens: mixed (high) DPI

Change-Id: I2fac889d896cf30ab2a79c306cee22177ad8f4ac
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

0 files changed, 0 insertions, 0 deletions