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Description of problem:
"--zoom" doesn't take effect for vnc guest

Version-Release number of selected component (if applicable):
virt-viewer-5.0-2.el7.x86_64
gtk-vnc2-0.5.2-7.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a vnc guest.
2. Run "virt-viewer -c qemu:///system rhel7.2 --zoom=10".

Actual results:
The window size always keep same for different zoom value.

Expected results:
The zoom value should take effect.

Additional info:

Created attachment 1267253 [details]
virt-viewer debug log

Posted: https://www.redhat.com/archives/virt-tools-list/2017-March/msg00111.html

reproduced with 
virt-viewer-5.0-2.el7.x86_64
verified with 
virt-viewer-5.0-3.el7.x86_64

connected to guest:
remote-viewer vnc://localhost:5900 --zoom=10 -> small remote-viewer window appears


remote-viewer vnc://localhost:5900 --zoom=150 -> larger remote-viewer window appears

Move to verified based on comment 6.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1849