Description of problem:
It is not possible to enable the display 1 of the multimonitor Windows virtual machine, when the display was disabled in the previous session, because the checkbox to enable display 1 is missing from the View->Displays menu.

Version-Release number of selected component (if applicable):
virt-viewer-2.0
spice-gtk3-0.29

guest: Windows 7, spice guest tools 0.100

How reproducible:
100%

Steps to Reproduce:
1. connect using remote-viewer to a win7 vm having 2 qxl devices
2. enable display 2 (View->Displays->Display 2)
3. disable display 1 (View->Displays->Display 1)
4. close remote-viewer
5. connect again
6. check View->Displays menu

Actual results:
It is not possible to enable the display 1, because the checkbox for "Display 1" is missing from the View->Displays menu

Expected results:
The menu contains "Display 1"

Additional info:
The display can be enabled using the "Screen resolution" applet.
In virt-viewer 1.0 the menu contains the checkbox for display 1