Indeed this is not related to Android and it should be better upstream. Thanks Daniel.
Although removing the Animation alleviates a lot the problem, it does not solve it.
Furthermore, it is not only Ubuntu problem. It appears to my Fedora, pretty similar to what I see in Ubuntu. And it appears (in both) very few times after disabling the animation.
Indeed this is not related to Android and it should be better upstream. Thanks Daniel.
Although removing the Animation alleviates a lot the problem, it does not solve it.
Furthermore, it is not only Ubuntu problem. It appears to my Fedora, pretty similar to what I see in Ubuntu. And it appears (in both) very few times after disabling the animation.