Images and tracks named by a prefix alone are bounded by the counter's total

"[…/559] - "lop1001.jpg"", "pic004.jpg", "DSC_0002[1].jpg", and tracks
"r86_022 - Gwen Guthrie - ….mp3" ("r"): the stem route keyed them by the
letters before the number alone, so every post of a poster was one release
(5,731 images for 559; 6,433 tracks for 457). Under a counter its total is
part of the key; a cover named as its archive's stem keeps the stem's key.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

edge/src/names.rs

@@ -847,7 +847,16 @@ pub fn release_identity(poster: &str, subject: &str, name: &str) -> Release {
         // Under a post token ("MDG005b - (01/90) "IMG_2307.JPG""): the post's too.
         // A word in it, not a size ("… alexis001.jpg 57295b").
         let post = is_post_token(&remainder) && remainder.as_bytes().windows(2).any(|w| w[0].is_ascii_alphabetic() && w[1].is_ascii_alphabetic());
-        let key = if post { hash(&["stem", poster, &set, &remainder]) } else { hash(&["stem", poster, &set]) };
+        // Under a counter, bounded by its total ("lop1001.jpg", "pic004.jpg": every post of the poster one release).
+        let mut parts: Vec<&str> = vec!["stem", poster, &set];
+        if post {
+            parts.push(&remainder);
+        }
+        // Not a cover named as its archive's stem ("x.jpg" beside "x.part01.rar").
+        if let Some(t) = total.as_deref().filter(|_| set != stem) {
+            parts.push(t);
+        }
+        let key = hash(&parts);
         return Release { key, name, source: "stem", file_total };
     }
     // An audiobook's or album's tracks without a name around them: by their name without its numbers.
@@ -861,7 +870,12 @@ pub fn release_identity(poster: &str, subject: &str, name: &str) -> Release {
         }
         let tracks = image_prefix(&stem);
         if !tracks.is_empty() {
-            return Release { key: hash(&["stem", poster, &tracks]), name: tracks, source: "stem", file_total };
+            // Bounded by a counter's total too ("r86_022 - Gwen Guthrie - … .mp3" → "r").
+            let key = match total.as_deref() {
+                Some(t) => hash(&["stem", poster, &tracks, t]),
+                None => hash(&["stem", poster, &tracks]),
+            };
+            return Release { key, name: tracks, source: "stem", file_total };
         }
     }
     // A season's episodes under a bare counter ("Pokemon - S02E01 - Pallet Party Panic.mkv"): per show, season and total.
@@ -1546,6 +1560,13 @@ mod image_set_tests {
         );
         let jb = |i: &str, n: &str| super::release_identity("JBinUp", &format!(r#"[{i}/58] - Summer Power Up - "{n}" yEnc"#), n);
         assert_eq!(jb("01", "www.realmom.info - XVID- Farbiges Krabbeltier.r00").key, jb("54", "www.realmom.info - XVID-Farbiges Krabbeltier.vol03+04.par2").key);
+        let lop = |i: &str, total: &str, n: &str| super::release_identity("p", &format!(r#"[{i}/{total}] - "{n}" yEnc"#), n);
+        assert_eq!(lop("001", "559", "lop1001.jpg").key, lop("002", "559", "lop1002.jpg").key);
+        assert_ne!(lop("001", "559", "lop1001.jpg").key, lop("001", "1018", "lop5001.jpg").key);
+        assert_ne!(
+            lop("022", "457", "r86_022 - Gwen Guthrie - Ain't Nothing Going on but the Rent.mp3").key,
+            lop("022", "333", "r98_333 - Jellie - Roller Coaster.mp3").key
+        );
         let mdg = |post: &str, i: &str, n: &str| super::release_identity("p", &format!(r#"{post} - ({i}/90) "{n}" - 16,14 MB - yEnc"#), n);
         assert_eq!(mdg("MDG005b", "01", "IMG_2307.JPG").key, mdg("MDG005b", "02", "IMG_2308.jpg").key);
         assert_ne!(mdg("MDG005b", "01", "IMG_2307.JPG").key, mdg("MDG006a", "01", "IMG_4410.JPG").key);