feat(clap_complete): Add support for visible subcommand aliases

clap_complete/src/dynamic/completer.rs

@@ -334,8 +334,11 @@ fn possible_values(a: &clap::Arg) -> Option<Vec<clap::builder::PossibleValue>> {
 fn subcommands(p: &clap::Command) -> Vec<(String, Option<StyledStr>)> {
     debug!("subcommands: name={}", p.get_name());
     debug!("subcommands: Has subcommands...{:?}", p.has_subcommands());
-
     p.get_subcommands()
-        .map(|sc| (sc.get_name().to_string(), sc.get_about().cloned()))
+        .flat_map(|sc| {
+            sc.get_name_and_visible_aliases()
+                .into_iter()
+                .map(|s| (s.to_string(), sc.get_about().cloned()))
+        })
         .collect()
 }

clap_complete/tests/testsuite/dynamic.rs

@@ -33,6 +33,36 @@ help\tPrint this message or the help of the given subcommand(s)"
     );
 }
 
+#[test]
+fn suggest_subcommand_aliases() {
+    let mut cmd = Command::new("exhaustive")
+        .subcommand(
+            Command::new("hello-world")
+                .visible_alias("hello-world-foo")
+                .alias("hidden-world"),
+        )
+        .subcommand(
+            Command::new("hello-moon")
+                .visible_alias("hello-moon-foo")
+                .alias("hidden-moon"),
+        )
+        .subcommand(
+            Command::new("goodbye-world")
+                .visible_alias("goodbye-world-foo")
+                .alias("hidden-goodbye"),
+        );
+
+    assert_data_eq!(
+        complete!(cmd, "hello"),
+        snapbox::str![
+            "hello-moon
+hello-moon-foo
+hello-world
+hello-world-foo"
+        ],
+    );
+}
+
 #[test]
 fn suggest_long_flag_subset() {
     let mut cmd = Command::new("exhaustive")