Add completion because pressing only <Tab> to complete the commands is allowed. <Shift><Tab> is not allowed, it doesn't do anything. For example in /q<Tab> cycles through commands /query, /quit, /quote, and /Q. So if one would type /qu<Tab> to complete to /query and then press <Shift> to cycle next to /quit. After that pressing <Shift><Tab> it would complete back to /query.
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