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Currently using mp.input while the console is open doesn't do anything.
We can allow using mp.input multiple times in a row by keeping the
console open, and sending a closed event only when the previous calling
script is different from the current one. If it is the same, sending a
closed event would unregister the new input-event listener, so it is
just never sent in this case as there is no sane way to do it. This is
useful e.g. to try out select script bindings in the console, or to
switch to a different mp.input script binding with a key binding without
having to close the current one.
Calling input.select() again within input.select()'s submit handler
needs to be fixed separately because with select the console is
immediately closed on submit (367a6b561a), so input.lua receives submit,
requests a new selection, and receives closed wich unregisters the
handler of the new selection. Just not calling
mp.unregister_script_message("input-event") fixes it; its only purpose
was to allow garbage collection of variables defined in the scope using
mp.input.
Fixes #15795.