Auto Move Windows interfering with Dynamic Workspaces
When Auto Move Windows is enabled on Ubuntu 18.04.1 LTS, the Dynamic Workspaces behaviour is altered. Per my observations with the first two workspaces occupied by open windows, opening windows in subsequent workspaces, then closing the windows, results in all of the workspaces remaining open. Disabling Auto Move Windows, then clicking on a higher workspace in the Overview, causes the empty workspaces to close as they should.