Fixed regression that broke fuzzy matching for slash commands (#7859)

This addresses bug #7857 which was introduced recently as part of PR
#7704.

codex-rs/tui/src/bottom_pane/chat_composer.rs

@@ -43,6 +43,7 @@ use crate::render::renderable::Renderable;
 use crate::slash_command::SlashCommand;
 use crate::slash_command::built_in_slash_commands;
 use crate::style::user_message_style;
+use codex_common::fuzzy_match::fuzzy_match;
 use codex_protocol::custom_prompts::CustomPrompt;
 use codex_protocol::custom_prompts::PROMPTS_CMD_PREFIX;
 
@@ -1621,7 +1622,7 @@ impl ChatComposer {
 
         let builtin_match = built_in_slash_commands()
             .into_iter()
-            .any(|(cmd_name, _)| cmd_name.starts_with(name));
+            .any(|(cmd_name, _)| fuzzy_match(cmd_name, name).is_some());
 
         if builtin_match {
             return true;
@@ -1630,7 +1631,7 @@ impl ChatComposer {
         let prompt_prefix = format!("{PROMPTS_CMD_PREFIX}:");
         self.custom_prompts
             .iter()
-            .any(|p| format!("{prompt_prefix}{}", p.name).starts_with(name))
+            .any(|p| fuzzy_match(&format!("{prompt_prefix}{}", p.name), name).is_some())
     }
 
     /// Synchronize `self.command_popup` with the current text in the
@@ -3982,8 +3983,15 @@ mod tests {
             "'/re' should activate slash popup via prefix match"
         );
 
-        // Case 3: invalid prefix "/zzz" – still allowed to open popup if it
-        // matches no built-in command, our current logic will *not* open popup.
+        // Case 3: fuzzy match "/ac" (subsequence of /compact and /feedback)
+        composer.set_text_content("/ac".to_string());
+        assert!(
+            matches!(composer.active_popup, ActivePopup::Command(_)),
+            "'/ac' should activate slash popup via fuzzy match"
+        );
+
+        // Case 4: invalid prefix "/zzz" – still allowed to open popup if it
+        // matches no built-in command; our current logic will not open popup.
         // Verify that explicitly.
         composer.set_text_content("/zzz".to_string());
         assert!(

codex-rs/tui/src/bottom_pane/command_popup.rs

@@ -373,4 +373,23 @@ mod tests {
         let description = rows.first().and_then(|row| row.description.as_deref());
         assert_eq!(description, Some("send saved prompt"));
     }
+
+    #[test]
+    fn fuzzy_filter_matches_subsequence_for_ac() {
+        let mut popup = CommandPopup::new(Vec::new(), false);
+        popup.on_composer_text_change("/ac".to_string());
+
+        let cmds: Vec<&str> = popup
+            .filtered_items()
+            .into_iter()
+            .filter_map(|item| match item {
+                CommandItem::Builtin(cmd) => Some(cmd.command()),
+                CommandItem::UserPrompt(_) => None,
+            })
+            .collect();
+        assert!(
+            cmds.contains(&"compact") && cmds.contains(&"feedback"),
+            "expected fuzzy search for '/ac' to include compact and feedback, got {cmds:?}"
+        );
+    }
 }