I just witnessed it happen without any visual sign of something triggering it. I was reading an email in evolution, which was full screen. Without touching anything the window slide under the launcher.
This is happening often, and is new behaviour. So I assume it was introduced in unity 3.6.6-0ubuntu1 or maybe compiz 0.9.4-0ubuntu7 last week.
I just witnessed it happen without any visual sign of something triggering it. I was reading an email in evolution, which was full screen. Without touching anything the window slide under the launcher.
This is happening often, and is new behaviour. So I assume it was introduced in unity 3.6.6-0ubuntu1 or maybe compiz 0.9.4-0ubuntu7 last week.