I'm looking to quickly switch between to windows of an application in Unity. I looked at Unable to switch between different windows of the same application but I didn't get any answer.

The only option I've got is to long-click on the icon on the dash and click on the window when they're all shown. That's definitely too long ! I'm sure there is a shortcut, like an Alt+Tab but I don't find it.

So, how can I quickly switch between windows of an application ?