fix(complete): remove duplicate bash subcmd cases caused by aliases

Visible alias completions were causing duplicate case conditions when
offering subcommand completions, due to the fact that they share the
same function name as the command they are aliasing. This commit
deduplicates them so as to not redefine the exact same case statement
logic.

clap_complete/src/aot/shells/bash.rs

@@ -132,6 +132,7 @@ fn subcommand_details(cmd: &Command) -> String {
         .collect::<Vec<_>>();
 
     scs.sort();
+    scs.dedup();
 
     subcmd_dets.extend(scs.iter().map(|sc| {
         format!(

clap_complete/tests/snapshots/sub_subcommands.bash

@@ -152,20 +152,6 @@ _my-app() {
             COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
             return 0
             ;;
-        my__app__some_cmd)
-            opts="-h -V --help --version sub_cmd help"
-            if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
-                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
-                return 0
-            fi
-            case "${prev}" in
-                *)
-                    COMPREPLY=()
-                    ;;
-            esac
-            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
-            return 0
-            ;;
         my__app__some_cmd__help)
             opts="sub_cmd help"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then