PhysicalPrinters improvements:

- Added possibility to correct delete presets considering with the physical printers
- Smart switching to the printer preset if physical printer was selected

src/slic3r/GUI/PresetComboBoxes.hpp

@@ -166,7 +166,7 @@ class TabPresetComboBox : public PresetComboBox
     bool show_incompatible {false};
     bool m_enable_all {false};
 
-    std::function<void(std::string)>    update_ph_printers { nullptr };
+    bool    m_allow_to_update_physical_printers {false};
 
 public:
     TabPresetComboBox(wxWindow *parent, Preset::Type preset_type);
@@ -174,8 +174,8 @@ public:
     void set_show_incompatible_presets(bool show_incompatible_presets) {
         show_incompatible = show_incompatible_presets;
     }
-    void set_update_physical_printers_function(std::function<void(std::string)> update_fn) {
-        update_ph_printers = update_fn;
+    void allow_to_update_physical_printers() {
+        m_allow_to_update_physical_printers = m_type == Preset::TYPE_PRINTER;
     }
 
     void update() override;
@@ -263,6 +263,32 @@ protected:
     void on_sys_color_changed() override {};
 };
 
+
+//------------------------------------------------
+//          ChangePresetForPhysicalPrinterDialog
+//------------------------------------------------
+
+class ChangePresetForPhysicalPrinterDialog : public DPIDialog
+{
+    void OnOK(wxEvent& event);
+
+public:
+
+    enum SelectionType
+    {
+        Switch,
+        ChangePreset,
+        AddPreset
+    } m_selection {Switch};
+
+    ChangePresetForPhysicalPrinterDialog(const std::string& preset_name);
+    ~ChangePresetForPhysicalPrinterDialog() {}
+
+protected:
+    void on_dpi_changed(const wxRect& suggested_rect) override;
+    void on_sys_color_changed() override {};
+};
+
 } // namespace GUI
 } // namespace Slic3r