improve tab reorder logic

app/lib/features/geckoview/features/tabs/data/database/daos/container.dart

@@ -96,4 +96,11 @@ class ContainerDao extends DatabaseAccessor<TabDatabase>
   ) {
     return db.orderKeyAfterTab(containerId: containerId, tabId: tabId);
   }
+
+  SingleSelectable<String> generateOrderKeyBeforeTabId(
+    String? containerId,
+    String tabId,
+  ) {
+    return db.orderKeyBeforeTab(containerId: containerId, tabId: tabId);
+  }
 }

app/lib/features/geckoview/features/tabs/data/database/database.drift

@@ -118,6 +118,18 @@ orderKeyAfterTab(:tab_id AS TEXT, :container_id AS TEXT OR NULL):
   FROM ordered_table
   WHERE id = :tab_id;
 
+orderKeyBeforeTab(:tab_id AS TEXT, :container_id AS TEXT OR NULL):
+  WITH ordered_table AS (
+    SELECT id,
+          order_key,
+          LAG(order_key) OVER (ORDER BY order_key) AS prev_order_key
+    FROM tab 
+    WHERE container_id IS :container_id 
+  )
+  SELECT lexo_rank_reorder_before(order_key, prev_order_key)
+  FROM ordered_table
+  WHERE id = :tab_id;
+
 queryTabsBasic WITH TabQueryResult:
   WITH weights AS (
     SELECT 

app/lib/features/geckoview/features/tabs/data/database/database.g.dart

@@ -1165,6 +1165,17 @@ abstract class _$TabDatabase extends GeneratedDatabase {
     ).map((QueryRow row) => row.read<String>('_c0'));
   }
 
+  Selectable<String> orderKeyBeforeTab({
+    String? containerId,
+    required String tabId,
+  }) {
+    return customSelect(
+      'WITH ordered_table AS (SELECT id, order_key, LAG(order_key)OVER (ORDER BY order_key RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW EXCLUDE NO OTHERS) AS prev_order_key FROM tab WHERE container_id IS ?1) SELECT lexo_rank_reorder_before(order_key, prev_order_key) AS _c0 FROM ordered_table WHERE id = ?2',
+      variables: [Variable<String>(containerId), Variable<String>(tabId)],
+      readsFrom: {tab},
+    ).map((QueryRow row) => row.read<String>('_c0'));
+  }
+
   Selectable<TabQueryResult> queryTabsBasic({required String query}) {
     return customSelect(
       'WITH weights AS (SELECT 10.0 AS title_weight, 5.0 AS url_weight) SELECT t.id, t.title, CAST(t.url AS TEXT) AS url, t.url AS clean_url, bm25(tab_fts, weights.title_weight, weights.url_weight) AS weighted_rank FROM tab_fts AS fts INNER JOIN tab AS t ON t."rowid" = fts."rowid" CROSS JOIN weights WHERE fts.title LIKE ?1 OR fts.url LIKE ?1 ORDER BY weighted_rank ASC, t.timestamp DESC',