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Description of problem:
Currently, when PBP (Picture by Picture) is connected to computer outputs, Gnome doesn't recognize nor allow user to set up the outputs to act as a single physical monitor, resulting to behaviour such as panels being displayed in just one half of the monitor or apps in full screen being displayed on just one half of an actual physical screen. It would be nice for Gnome to reflect the reality of PBP monitors somehow so that they can be used smoothly

Version-Release number of selected component (if applicable):
gnome-shell-3.14.4-37.el7.x86_64
mutter-3.14.4-17.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. connect a monitor in PBP mode to two GPU outputs
2. try to set up the screen so it behaves as a single monitor
3.

Actual results:
PBP monitor is neither recognized, nor possible to set up to act as a single physical monitor (which it is...)

Expected results:
It's possible to use the screen as a single physical screen

Additional info: