Fallback register "Jump" operation to the only other account

There may be multiple splits but only one other account. In this scenario
we can jump to the first split for that account.

gnucash/gnome/gnc-plugin-page-register.cpp

@@ -4862,6 +4862,44 @@ gnc_plugin_page_register_cmd_exchange_rate (GSimpleAction *simple,
     LEAVE (" ");
 }
 
+static Split*
+jump_multiple_splits_by_single_account (Account *account, Split *split)
+{
+    Transaction *trans;
+    SplitList *splits;
+    Account *other_account = NULL;
+    Split *other_split = NULL;
+
+    trans = xaccSplitGetParent(split);
+    if (!trans)
+        return NULL;
+
+    for (splits = xaccTransGetSplitList(trans); splits; splits = splits->next)
+    {
+        Split *s = (Split*)splits->data;
+        Account *a = xaccSplitGetAccount(s);
+
+        if (!xaccTransStillHasSplit(trans, s))
+            continue;
+
+        if (a == account)
+            continue;
+
+        if (other_split)
+        {
+            if (other_account != a)
+                return NULL;
+
+            continue;
+        }
+
+        other_account = a;
+        other_split = s;
+    }
+
+    return other_split;
+}
+
 static Split*
 jump_multiple_splits_by_value (Account *account, Split *split, gboolean largest)
 {
@@ -4921,7 +4959,8 @@ jump_multiple_splits (Account* account, Split *split)
         break;
     }
 
-    return NULL;
+    // If there's only one other account, use that one
+    return jump_multiple_splits_by_single_account (account, split);
 }
 
 static void