snapshots-prop: Longer view
snapshots-prop: Longer view

Snapshots property has its own page and currently it takes only a part
of the whole page, which doesn't look so good. This patch makes it take
a lot of the (vertical) space given to it.

https://bugzilla.gnome.org/show_bug.cgi?id=738517

vbenes/gnome-boxes,vbenes/gnome-boxes