Description of problem:
Click "view->fullscreen" two times makes guest in bad fullscreen mode

Version-Release number of selected component (if applicable):
virt-manager-1.4.0-2.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1. Prepare a spice guest and make sure spice-vdagentd service is running.
2. Make sure "View->Scal Display->Auto resize VM with window" is checked.
3. make sure guest is not maximized.
4. Open the guest by virt-manager, click "view"->"fullscreen" to make it in fullscreen mode.
5. Click the toolbar to exit fullscreen mode, and click "view"->"fullscreen" to make it in fullscreen mode again.

Actual results:
The guest's desktop doesn't fill and extend the host's desktop.

Expected results:
The guest should be in correct fullscreen mode.

Additional info:
I attached a viedo for this problem.