Weston screenshooter blocks the display for over a second

[CHUCO POGA]

When attempting to make a screenshot under weston with Mod + S
(weston-screenshooter), the entire display get's blocked for over a second.
That causes an ugly jitter on the screen when displaying dynamic content
(such as movies)

I have looked into the screenshooter client code and did some performance
measurements, and it appears that the while(!buffer_copy_done) loop which
calls wl_display_roundtrip takes a second to finish. Is there any way to
make the screenshot async, to not interfere the currently displayed
content? Or is it the way the protocol works under the hood?
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