Importing a world with channels open unwanted dialog boxes
#channel action has a simple behavior. If the channel doesn't exist, it is created. If it exists, it is displayed. Therefore, when one imports a world but already has the defined channel, the
#channel action is called a second time and the channel is displayed. A dialog pops up during installation, which isn't very user-friendly, since the installation "blocks" while the dialog is open.
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