Comment 1 for bug 689792

Both of these animations are simply not possible right now. Getting a
preview of a window at a different size requires resizing the window,
which if done today would be a giant hack that would likely result in
unpredictable bugs. Animations cannot rely on being able to render the
window at multiple sizes.

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Jason Smith | Desktop Experience Team
GNOME Developer
Canonical USA Inc.
T. +1.248.756.6266 | <email address hidden>
Ubuntu - Linux for human beings | www.ubuntu.com