LRC-LIB-KEYWORDS: the filter follows a keyword moved into a new parent

`keyword.move` worked out where the keyword landed from the parent's
spelling in the library, and fell back to the top level when the
parent didn't exist yet, while the catalog made that parent: the
keyword filter stayed on the old path and the grid showed nothing. It
now lands the filter where the catalog puts the keyword.

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

crates/engine/src/cmd/keywords.rs

@@ -301,15 +301,16 @@ pub fn specs() -> Vec<CommandSpec> {
                     Some(Value::Null) => None,
                     _ => return Err(bad("keyword.move", "`parent` is a keyword, or null for the top level")),
                 };
+                // where it lands, as the catalog spells it: a parent that doesn't exist yet is made
+                let leaf = from.rsplit('|').next().unwrap_or(&from).to_string();
+                let to = match parent.as_deref().map(|k| s.catalog.keyword_path(k).unwrap_or_else(|| clean(k))).filter(|k| !k.is_empty()) {
+                    Some(parent) => format!("{parent}|{leaf}"),
+                    None => leaf,
+                };
                 let op = s
                     .catalog
                     .move_keyword_ops(&from, parent.as_deref(), bool_or(p, "merge", false))
                     .map_err(|e| refused("keyword.move", e, ": moving would merge the two (merge: true)"))?;
-                let leaf = from.rsplit('|').next().unwrap_or(&from).to_string();
-                let to = match parent.as_deref().and_then(|k| s.catalog.keyword_path(k)) {
-                    Some(parent) => format!("{parent}|{leaf}"),
-                    None => leaf,
-                };
                 commit_keywords(s, "Move Keyword", op, |k| Some(if is_under(k, &from) { reparent(k, &from, &to) } else { k.to_string() }))
             }
         ),

crates/engine/src/tests_keyword_list.rs

@@ -129,3 +129,16 @@ fn purging_unused_keywords() {
     s.execute("edit.undo", &json!({})).unwrap();
     assert!(s.execute("keyword.info", &json!({"keyword": "Weddings"})).is_ok());
 }
+
+/// Moving a keyword into a parent that doesn't exist yet makes that parent, and the keyword filter
+/// follows the keyword there (the grid kept filtering by the old path, and showed nothing).
+#[test]
+fn the_filter_follows_a_keyword_moved_into_a_new_parent() {
+    let mut s = Session::with_demo();
+    let id = s.visible_cloned()[0].0;
+    s.execute("photo.setMeta", &json!({"ids": [id], "keywords": ["Rome"]})).unwrap();
+    s.execute("library.filter", &json!({"keyword": "Rome"})).unwrap();
+    s.execute("keyword.move", &json!({"keyword": "rome", "parent": "Italy"})).unwrap();
+    assert_eq!(keywords_of(&s, id), ["Italy|Rome"]);
+    assert_eq!(s.filter.keyword.as_deref(), Some("Italy|Rome"));
+}