Bug 576916: 'keywordaction' is undefined when editing a single bug

process_bug.cgi

@@ -258,7 +258,8 @@ foreach my $field_name (@set_fields) {
 }
 
 if (should_set('keywords')) {
-    my $action = $cgi->param('keywordaction');
+    my $action = $cgi->param('keywordaction') || '';
+    # Backward-compatibility for Bugzilla 3.x and older.
     $action = 'remove' if $action eq 'delete';
     $action = 'set'    if $action eq 'makeexact';
     $set_all_fields{keywords}->{$action} = $cgi->param('keywords');

template/en/default/list/edit-multiple.html.tmpl

@@ -230,8 +230,8 @@
         %]
         <select name="keywordaction">
           <option value="add">Add these keywords</option>
-          <option value="delete">Delete these keywords</option>
-          <option value="makeexact">Make the keywords be exactly this list</option>
+          <option value="remove">Delete these keywords</option>
+          <option value="set">Make the keywords be exactly this list</option>
         </select>
       </td>