Can't change resolution under KVM with QXL

When using Tails 3.2 using KVM and QXL for video, when changing it’s reolution size, the screen gets buggy, and unusable.

It doesn’t happen with Tails 3.1, nor when using Cirrus for video.

Feature Branch: doc/14786-libvirt-video

Original created by @mercedes508 on 14786 (Redmine)

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