[server] ShellSurface's transient is a dedicated mode
Review Request #125468 - Created Oct. 1, 2015 and submitted
So far transient was a mutual exclusive mode causing a transient window to not be able to be fullscreen. This seems wrong. Let's have transient still as a dedicated mode allowing the window to be maximized and/or fullscreen. Only popup stays a dedicated mode.
Test app opens fullscreen again.