Currently, the dockable windows for the chat window and the clientlist window are always visible on the screen. While they are minimized by default, it is not really possible to hide them.
The goal in this ticket is to add a menu that enables to show or hide these windows. This removes clutter from the standard setup if requested by the user. It also introduces the guts for a menu that may be put to other uses later, for example, to disconnect from the server.
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Tickets: #73