MDL-32245 question bank: update URL after moving question between cat…

…egories.

Also, improve the URL when you go to edit the questions in a category.

question/category_class.php

@@ -100,7 +100,7 @@ public function item_html($extraargs = array()){
         $editqestions = get_string('editquestions', 'question');
 
         /// Each section adds html to be displayed as part of this list item
-        $questionbankurl = new moodle_url("/question/edit.php", ($this->parentlist->pageurl->params() + array('category'=>"$category->id,$category->contextid")));
+        $questionbankurl = new moodle_url("/question/edit.php", ($this->parentlist->pageurl->params() + array('cat'=>"$category->id,$category->contextid")));
         $catediturl = $this->parentlist->pageurl->out(true, array('edit' => $this->id));
         $item = "<b><a title=\"{$str->edit}\" href=\"$catediturl\">" .
                 format_string($category->name, true, array('context' => $this->parentlist->context)) .
@@ -456,6 +456,8 @@ public function update_category($updateid, $newparent, $newname, $newinfo) {
             question_move_category_to_context($cat->id, $oldcat->contextid, $tocontextid);
         }
 
+        // Cat param depends on the context id, so update it.
+        $this->pageurl->param('cat', $updateid . ',' . $tocontextid);
         redirect($this->pageurl);
     }
 }