Method use_probing_tool

Marlin/src/module/probe.cpp:940–949

* Switches to the appropriate tool (PROBING_TOOL) for probing (probing = true), and switches * back to the old tool when probing = false. Uses statics to avoid unnecessary checks and to * cache the previous tool, so always call with false after calling with true. */

   * cache the previous tool, so always call with false after calling with true.
   */
  void Probe::use_probing_tool(const bool probing/*=true*/) {
    static uint8_t old_tool;
    static bool old_state = false;
    if (probing == old_state) return;
    old_state = probing;
    if (probing) old_tool = active_extruder;
    const uint8_t tool = probing ? PROBING_TOOL : old_tool;
    if (tool != active_extruder)
      tool_change(tool, ENABLED(PROBE_TOOLCHANGE_NO_MOVE));
  }

#endif