Make "Jump to Unread" links work with scrolled history

Previously, clicking "Jump to Unread" would have no effect if the history
was already visible but lacked the unread transaction.

Technically, the lastTransactionId is always inferred from the existing
transaction list, so resetting it is unnecessary.

Author: sunnavy

share/html/Elements/ShowHistoryHeader

@@ -318,7 +318,7 @@ jQuery(function(){
         loadAll = false;
 
         // check for link to specific transaction and make sure we load enough to focus it
-        if (hash && !lastTransactionId) {
+        if (hash) {
             var matches = hash.match(/^#txn-(\d+)$/);
             if (matches) {
                 hashTransactionId = matches[1];
@@ -406,7 +406,6 @@ jQuery(function(){
         var link = jQuery(this);
         if ( link[0].hash ) {
             hash = link[0].hash;
-            lastTransactionId = null;
             loadHistoryPage();
         }
         return true;

share/html/Helpers/TicketHistoryPage

@@ -166,7 +166,8 @@ if ($ShowPagination && defined $Page) {
     $transactions->Limit(
         FIELD    => 'id',
         OPERATOR => $oldestTransactionsFirst ? '<=' : '>=',
-        VALUE    => $focusTransactionId
+        VALUE    => $focusTransactionId,
+        ENTRYAGGREGATOR => 'AND',
     );
 } elsif (!$loadAll) { # otherwise, just load the standard page of 10 transactions
     $transactions->RowsPerPage(10);