Add card mod column for notes mode

rslib/src/backend/search/browser_table.rs

@@ -23,8 +23,9 @@ const CARD_COLUMNS: [browser_table::Column; 15] = [
     browser_table::Column::Notetype,
 ];
 
-const NOTE_COLUMNS: [browser_table::Column; 12] = [
+const NOTE_COLUMNS: [browser_table::Column; 13] = [
     browser_table::Column::CardDeck,
+    browser_table::Column::CardMod,
     browser_table::Column::NoteCards,
     browser_table::Column::NoteCreation,
     browser_table::Column::NoteDue,

rslib/src/browser_table.rs

@@ -296,7 +296,7 @@ impl RowContext {
             Column::CardEase => self.card_ease_str(),
             Column::CardInterval => self.card_interval_str(),
             Column::CardLapses => self.cards[0].lapses.to_string(),
-            Column::CardMod => self.cards[0].mtime.date_string(),
+            Column::CardMod => self.card_mod_str(),
             Column::CardReps => self.cards[0].reps.to_string(),
             Column::CardTemplate => self.template_str()?,
             Column::NoteCreation => self.note_creation_str(),
@@ -394,6 +394,15 @@ impl RowContext {
         }
     }
 
+    fn card_mod_str(&self) -> String {
+        self.cards
+            .iter()
+            .map(|c| c.mtime)
+            .max()
+            .unwrap()
+            .date_string()
+    }
+
     fn deck_str(&mut self) -> String {
         if self.notes_mode {
             let decks = self.cards.iter().map(|c| c.deck_id).unique().count();

rslib/src/search/card_mod_order.sql

@@ -0,0 +1,10 @@
+DROP TABLE IF EXISTS sort_order;
+CREATE TEMPORARY TABLE sort_order (
+  pos integer PRIMARY KEY,
+  nid integer NOT NULL UNIQUE
+);
+INSERT INTO sort_order (nid)
+SELECT nid
+FROM cards
+GROUP BY nid
+ORDER BY MAX(mod);

rslib/src/search/mod.rs

@@ -256,6 +256,7 @@ fn card_order_from_sortkind(kind: SortKind) -> Cow<'static, str> {
 fn note_order_from_sortkind(kind: SortKind) -> Cow<'static, str> {
     match kind {
         SortKind::CardDeck
+        | SortKind::CardMod
         | SortKind::NoteCards
         | SortKind::NoteDue
         | SortKind::NoteEase
@@ -282,6 +283,7 @@ fn prepare_sort(col: &mut Collection, kind: SortKind, items: SearchItems) -> Res
                 include_str!("deck_order.sql")
             }
         }
+        CardMod if notes_mode => include_str!("card_mod_order.sql"),
         CardTemplate => include_str!("template_order.sql"),
         NoteCards => include_str!("note_cards_order.sql"),
         NoteDue => include_str!("note_due_order.sql"),