X11 screen not resized on output disconnect

[romangg]

The screen is not reduced in size when an output is removed. Likely we just do not react correctly to the signal from the X11 windowing system.

xrandr output after such a disconnect:

Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
DP-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 878mm x 485mm
   3840x2160     60.00*+  30.00    29.97  
   1920x2160     60.00  
   2560x1440     59.95  
   2048x1152     60.00  
   1920x1200     59.88  
   1920x1080     60.00    50.00    59.94    24.00    23.98  
   1600x1200     60.00  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      60.00  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
HDMI-1 disconnected 1920x1200+3840+0 (normal left inverted right x axis y axis) 0mm x 0mm
DVI-D-1 disconnected (normal left inverted right x axis y axis)
DVI-D-2 disconnected (normal left inverted right x axis y axis)
  1920x1200 (0x727) 154.000MHz +HSync -VSync
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock  74.04KHz
        v: height 1200 start 1203 end 1209 total 1235           clock  59.95Hz

[romangg]

mentioned in commit 03bdd06abc709dad69d718fe3016a4405f5dadd5