[Libguestfs] another GTK3 regression...

(this reproduces at commit 0687cea6a86e; IOW the regression is not from the recent GTK-related patches, but due to building p2v with GTK3. as opposed to GTK2) In the first dialog, when the Test Connection button is clicked, a spinner is supposed to be shown to the left, while p2v communicates via v2v over ssh. This spinner is seen when running virt-p2v directly, but not when running virt-p2v from a VM (using either a Live CD, or the "run-virt-p2v-in-a-vm" makefile target). This difference is not seen when virt-p2v is built with GTK2; in that case, *both* scenarios (direct & VM) show the spinner properly. I don't have an idea what the cause is. I vaguely suspect it could be related to the windowing environment (window manager) in use. It pretty much looks like a GTK3 bug to me; whatever the windowing environment, the spinner should either be there or not. (It's possible that we have a virt-p2v bug, of course, but why isn't the symptom consistent then? GTK3 should not have a dependency at all on the Window Manager.) Laszlo