xrandr - Multiple monitors, one rotated, mouse can disappear into non-desktop space

[Ryan Felder]

I can't seem to find any mention of this elsewhere. I have two monitors on
a machine, the primary is portrait, the secondary is landscape. I can
'lose' my mouse in the empty space above my landscape monitor.

If I have two monitors of different sizes, but no rotation, the mouse stops
at the screen border where I would expect, preventing me from losing my
mouse, but this functionality does not appear to be preserved when rotation
is the cause of the different sized monitors.

I cannot seem to find any xrandr setting to address this. I am running
Ubuntu 16.04, Elementary/Pantheon desktop environment. My xrandr output is
below. Is there anything I can do to fix this?

Screen 0: minimum 8 x 8, current 3125 x 1920, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 1200x1920+0+0 left (normal left inverted right x
axis y axis) 520mm x 320mm
   1920x1200     59.95*+
   1920x1080     60.00
   1600x1200     60.00
   1680x1050     59.88
   1280x1024     60.02
   1280x960      60.00
   1024x768      60.00
   800x600       60.32
   640x480       59.94
   720x400       70.08
HDMI2 connected 1920x1200+1205+538 (normal left inverted right x axis y
axis) 520mm x 320mm
   1920x1200     59.95*+
   1920x1080     60.00
   1600x1200     60.00
   1680x1050     59.88
   1280x1024     60.02
   1280x960      60.00
   1024x768      60.00
   800x600       60.32
   640x480       59.94
   720x400       70.08
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
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