n> <span class="n">enable_atom</span><span class="p">,</span> <span class="n">item_flag_atom</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">xstudio.core</span><span class="w"> </span><span class="kn">import</span> <span class="n">active_range_atom</span><span class="p">,</span> <span class="n">available_range_atom</span><span class="p">,</span> <span class="n">undo_atom</span><span class="p">,</span> <span class="n">redo_atom</span><span class="p">,</span> <span class="n">histor