(I think this is a long time known bug but I don't see a bug for it)
With animation=zoom in weston.ini, when a window is opened it zooms in, but the zoom is not complete and seems to stop at 99% or so, showing fuzziness (not sure if that's the proper English word). You need to move the mouse (or sometimes wait a second or two) for the window to get zoomed to 100%.
I see the issue, and no, I didn't know about that one. (fuzziness sounds like the right word to me, btw)
Author: Kristian Høgsberg <firstname.lastname@example.org>
Date: Wed Oct 30 09:07:04 2013 -0700
animation.c: Schedule a repaint when the animation is done
Otherwise we don't repaint with the final state of the surface and
we're stuck with the second-to-last frame of the animation until
something else (moving the mouse or such) triggers a redraw.