Fix crash when creating a physical printer & having a dirty printer

supermerill/SuperSlicer#1631

src/slic3r/GUI/PhysicalPrinterDialog.cpp

@@ -180,7 +180,14 @@ PhysicalPrinterDialog::PhysicalPrinterDialog(wxWindow* parent, wxString printer_
 
     m_printer_name    = new wxTextCtrl(this, wxID_ANY, printer_name, wxDefaultPosition, wxDefaultSize);
     m_printer_name->Bind(wxEVT_TEXT, [this](wxEvent&) { this->update_full_printer_names(); });
-
+    m_printer_name->Bind(wxEVT_SET_FOCUS, [this](wxFocusEvent& e) {
+        if (m_printer_name->GetValue() == m_default_name) m_printer_name->SetValue("");
+        e.Skip();
+    });
+    m_printer_name->Bind(wxEVT_KILL_FOCUS, [this](wxFocusEvent& e) {
+        if (m_printer_name->GetValue().empty()) m_printer_name->SetValue(m_default_name);
+        e.Skip();
+    }); 
     PhysicalPrinterCollection& printers = wxGetApp().preset_bundle->physical_printers;
     PhysicalPrinter* printer = printers.find_printer(into_u8(printer_name));
     if (!printer) {

src/slic3r/GUI/Tab.cpp

@@ -366,6 +366,33 @@ void Tab::create_preset_tab()
 
     if (m_btn_edit_ph_printer)
         m_btn_edit_ph_printer->Bind(wxEVT_BUTTON, [this](wxCommandEvent e) {
+            // ask for saving modif before
+            if (m_presets->current_is_dirty()) {
+                //ok = may_discard_current_dirty_preset(nullptr, "");
+                UnsavedChangesDialog dlg(Preset::Type::TYPE_PRINTER, m_presets, "");
+                if (dlg.ShowModal() == wxID_CANCEL)
+                    return;
+
+                if (dlg.save_preset())  // save selected changes
+                {
+                    const std::vector<std::string>& unselected_options = dlg.get_unselected_options(Preset::Type::TYPE_PRINTER);
+                    const std::string& name = dlg.get_preset_name();
+
+                    // revert unselected options to the old values
+                    m_presets->get_edited_preset().config.apply_only(m_presets->get_selected_preset().config, unselected_options);
+                    save_preset(name);
+
+                    for (const std::pair<std::string, Preset::Type>& nt : dlg.get_names_and_types())
+                        m_preset_bundle->save_changes_for_preset(nt.first, nt.second, dlg.get_unselected_options(nt.second));
+
+                    // if we saved changes to the new presets, we should to 
+                    // synchronize config.ini with the current selections.
+                    m_preset_bundle->export_selections(*wxGetApp().app_config);
+                } else {
+                    // discard all changes
+                    m_presets->discard_current_changes();
+                }
+            }
             if (m_preset_bundle->physical_printers.has_selection())
                 m_presets_choice->edit_physical_printer();
             else
@@ -3500,8 +3527,7 @@ bool Tab::may_discard_current_dirty_preset(PresetCollection* presets /*= nullptr
 
             // copy selected options to the cache from edited preset
             cache_config_diff(selected_options);
-        }
+        } else
-        else
             wxGetApp().get_tab(presets->type())->cache_config_diff(selected_options);
     }
 

src/slic3r/GUI/UnsavedChangesDialog.cpp

@@ -646,9 +646,13 @@ void UnsavedChangesDialog::build(Preset::Type type, PresetCollection* dependent_
     };
 
     const PresetCollection& printers = wxGetApp().preset_bundle->printers;
-    if (dependent_presets && (type == dependent_presets->type() ?
+    // get the preset we switch to (if it exists)
-        dependent_presets->get_edited_preset().printer_technology() == dependent_presets->find_preset(new_selected_preset)->printer_technology() :
+    const Preset* new_preset = nullptr;
-        printers.get_edited_preset().printer_technology() == printers.find_preset(new_selected_preset)->printer_technology()))
+    if (dependent_presets)
+        new_preset = (type == dependent_presets->type() ? dependent_presets->find_preset(new_selected_preset) : printers.find_preset(new_selected_preset));
+    if (new_preset && dependent_presets && (type == dependent_presets->type() ?
+        dependent_presets->get_edited_preset().printer_technology() == new_preset->printer_technology() :
+        printers.get_edited_preset().printer_technology() == new_preset->printer_technology()))
         add_btn(&m_transfer_btn, m_move_btn_id, "paste_menu", Action::Transfer, _L("Transfer"));
     add_btn(&m_discard_btn, m_continue_btn_id, dependent_presets ? "switch_presets" : "exit", Action::Discard, _L("Discard"), false);
     add_btn(&m_save_btn, m_save_btn_id, "save", Action::Save, _L("Save"));
@@ -1042,7 +1046,7 @@ void UnsavedChangesDialog::update(Preset::Type type, PresetCollection* dependent
     m_discard_btn  ->Bind(wxEVT_ENTER_WINDOW, [this]                       (wxMouseEvent& e) { show_info_line(Action::Discard); e.Skip(); });
 
 
-    if (type == Preset::TYPE_INVALID) {
+    if (type == Preset::TYPE_INVALID || !dependent_presets) {
         m_action_line->SetLabel(header + "\n" + _L("The following presets were modified:"));
     }
     else {