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Correct screen size detection

Peter Hutterer requested to merge github/fork/kreijack/screen_size into master

Created by: kreijack

The XRandR api was used in a such way to get the DEFAULT size instead the current one. This patch create a helper function (detect_display_size()) which detects the current size of the screen; it is called both in the GuiCalibratorX11() constructor and in the redraw() method.

How reproduce the problem:

  1. compile xinput for X11 ( autogen.sh --with-gui=x11)
  2. change the resolution to a not default one (like xrandr -s 640x480)
  3. start xinput_calibrator
  4. the result is a window size equal to the size of the DEFAULT resolution of the screen, and not the current one
  5. expected result: a window size equal to the size of the CURRENT resolution of the screen

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