In Mac OS, the top menu bar is placed above any window, causing the
timelines being opened at (0,0) appear under it in such a way that the
timeline title bar is not reachable by the mouse, making it hard to
move.
This simple solution opens the windows a bit away from the top left
corner, at (100,100).
Fixes: https://pm.bsc.es/gitlab/rarias/ovni/-/issues/180
There is no reason to hide the thread (in the thread timeline) when
enters in Cooling or Warming states, as it won't cause any
oversubscription problem. CPU channel is still kept to track the running
thread.