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Currently +, - and 0 used for zooming operations must be the ones from the keyboard (not from the number pad).
It happens due to a limitation in old versions of GTK+ (lower than 3.14) that doesn't us to use more than one accelerator per widget.

Hopefully we will be able to bump the GTK dependency till 4.1 and then work in the necessary changes on virt-viewer.

Posted: https://www.redhat.com/archives/virt-tools-list/2017-April/msg00012.html

I verified this problem with virt-viewer-5.0-3.el7.x86_64.

The virt-viewer window can zoom-in, zoom-out, zoom-reset by keypad and numpad.

So move the bug to VERIFIED.

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