Reproduction: - Enable compositor and Xfwm's "zoom" function - Hover pointer over GTK3 app - Hold easy-move key and use mousewheel -> Xfwm will zoom, but the app will scroll simultaneously. GTK2 applications do not appear to receive the mouse wheel events, but GTK3 ones do. I suspect this is related to GTK3's new scrolling functionality (smooth scrolling and all that).
It's because gtk+ 3.x uses XI2 events directly and those are not "stopped" by the old style grab xfwm4 uses. "XI1 grabs are different to XI2 grab and a device may not be grabbed through an XI2 grab if an XI1 grab is currently active on this device or vice versa." See Peter's write ups on XI2 events here: http://who-t.blogspot.fr/2009/05/xi2-recipes-part-1.html
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