FIX: try to reduce page fault while idling

jira: [none]
Change-Id: I563cbf4a8ba8a4ae1e5b1b1f735753d3aef23e16
(cherry picked from commit ed1e9678c351dc037f2e3cc7ea0e19d46731699c)

src/slic3r/GUI/Widgets/SideTools.cpp

@@ -57,6 +57,8 @@ void SideToolsPanel::on_timer(wxTimerEvent &event)
 
 void SideToolsPanel::set_current_printer_name(std::string dev_name)
 {
+     if (m_dev_name == from_u8(dev_name)) return;
+
      m_none_printer = false;
      m_dev_name     = from_u8(dev_name);
      Refresh();