Fixed many warnings in following files:

src/slic3r/Config/Snapshot.cpp
src/slic3r/GUI/Field.cpp
src/slic3r/GUI/GLToolbar.cpp
src/slic3r/GUI/GUI_ObjectList.cpp
src/slic3r/GUI/GUI_ObjectList.hpp
src/slic3r/GUI/Plater.cpp
src/slic3r/GUI/Plater.hpp
src/slic3r/GUI/PresetBundle.cpp
src/slic3r/GUI/Tab.cpp
src/slic3r/GUI/wxExtensions.cpp

src/slic3r/Config/Snapshot.cpp

@@ -202,9 +202,9 @@ void Snapshot::export_selections(AppConfig &config) const
     config.clear_section("presets");
     config.set("presets", "print",    print);
     config.set("presets", "filament", filaments.front());
-	for (int i = 1; i < filaments.size(); ++i) {
+    for (unsigned i = 1; i < filaments.size(); ++i) {
         char name[64];
-        sprintf(name, "filament_%d", i);
+        sprintf(name, "filament_%u", i);
         config.set("presets", name, filaments[i]);
     }
     config.set("presets", "printer",  printer);
@@ -373,9 +373,9 @@ const Snapshot&	SnapshotDB::take_snapshot(const AppConfig &app_config, Snapshot:
     snapshot.print   = app_config.get("presets", "print");
     snapshot.filaments.emplace_back(app_config.get("presets", "filament"));
     snapshot.printer = app_config.get("presets", "printer");
-    for (unsigned int i = 1; i < 1000; ++ i) {
+    for (unsigned i = 1; i < 1000; ++ i) {
         char name[64];
-        sprintf(name, "filament_%d", i);
+        sprintf(name, "filament_%u", i);
         if (! app_config.has("presets", name))
             break;
 	    snapshot.filaments.emplace_back(app_config.get("presets", name));

src/slic3r/GUI/Field.cpp

@@ -854,7 +854,7 @@ void Choice::set_value(const boost::any& value, bool change_event)
 			text_value = wxString::Format(_T("%i"), int(boost::any_cast<int>(value)));
 		else
 			text_value = boost::any_cast<wxString>(value);
-		auto idx = 0;
+        size_t idx = 0;
 		for (auto el : m_opt.enum_values)
 		{
 			if (el == text_value)

src/slic3r/GUI/GLToolbar.cpp

@@ -861,11 +861,10 @@ int GLToolbar::contains_mouse_horizontal(const Vec2d& mouse_pos, const GLCanvas3
     float left = m_layout.left + scaled_border;
     float top = m_layout.top - scaled_border;
 
-    int id = -1;
+
-    
+    for (size_t id=0; id<m_items.size(); ++id)
-    for (GLToolbarItem* item : m_items)
     {
-        ++id;
+        GLToolbarItem* item = m_items[id];
         
         if (!item->is_visible())
             continue;
@@ -936,11 +935,9 @@ int GLToolbar::contains_mouse_vertical(const Vec2d& mouse_pos, const GLCanvas3D&
     float left = m_layout.left + scaled_border;
     float top = m_layout.top - scaled_border;
 
-    int id = -1;
+    for (size_t id=0; id<m_items.size(); ++id)
-
-    for (GLToolbarItem* item : m_items)
     {
-        ++id;
+        GLToolbarItem* item = m_items[id];
 
         if (!item->is_visible())
             continue;

src/slic3r/GUI/GUI_ObjectList.cpp

@@ -422,7 +422,7 @@ DynamicPrintConfig& ObjectList::get_item_config(const wxDataViewItem& item) cons
                             (*m_objects)[obj_idx]->config;
 }
 
-wxDataViewColumn* ObjectList::create_objects_list_extruder_column(int extruders_count)
+wxDataViewColumn* ObjectList::create_objects_list_extruder_column(size_t extruders_count)
 {
     wxArrayString choices;
     choices.Add(_(L("default")));
@@ -435,9 +435,9 @@ wxDataViewColumn* ObjectList::create_objects_list_extruder_column(int extruders_
     return column;
 }
 
-void ObjectList::update_extruder_values_for_items(const int max_extruder)
+void ObjectList::update_extruder_values_for_items(const size_t max_extruder)
 {
-    for (int i = 0; i < m_objects->size(); ++i)
+    for (size_t i = 0; i < m_objects->size(); ++i)
     {
         wxDataViewItem item = m_objects_model->GetItemById(i);
         if (!item) continue;
@@ -453,7 +453,7 @@ void ObjectList::update_extruder_values_for_items(const int max_extruder)
         m_objects_model->SetValue(extruder, item, colExtruder);
 
         if (object->volumes.size() > 1) {
-            for (auto id = 0; id < object->volumes.size(); id++) {
+            for (size_t id = 0; id < object->volumes.size(); id++) {
                 item = m_objects_model->GetItemByVolumeId(i, id);
                 if (!item) continue;
                 if (!object->volumes[id]->config.has("extruder") ||
@@ -468,7 +468,7 @@ void ObjectList::update_extruder_values_for_items(const int max_extruder)
     }
 }
 
-void ObjectList::update_objects_list_extruder_column(int extruders_count)
+void ObjectList::update_objects_list_extruder_column(size_t extruders_count)
 {
     if (!this) return; // #ys_FIXME
     if (printer_technology() == ptSLA)
@@ -3262,7 +3262,7 @@ void ObjectList::change_part_type()
 void ObjectList::last_volume_is_deleted(const int obj_idx)
 {
 
-    if (obj_idx < 0 || obj_idx >= m_objects->size() || (*m_objects)[obj_idx]->volumes.size() != 1)
+    if (obj_idx < 0 || size_t(obj_idx) >= m_objects->size() || (*m_objects)[obj_idx]->volumes.size() != 1)
         return;
 
     auto volume = (*m_objects)[obj_idx]->volumes.front();

src/slic3r/GUI/GUI_ObjectList.hpp

@@ -182,15 +182,15 @@ public:
 
     void                create_objects_ctrl();
     void                create_popup_menus();
-    wxDataViewColumn*   create_objects_list_extruder_column(int extruders_count);
+    wxDataViewColumn*   create_objects_list_extruder_column(size_t extruders_count);
-    void                update_objects_list_extruder_column(int extruders_count);
+    void                update_objects_list_extruder_column(size_t extruders_count);
     // show/hide "Extruder" column for Objects List
     void                set_extruder_column_hidden(const bool hide) const;
     // update extruder in current config
     void                update_extruder_in_config(const wxDataViewItem& item);
     // update changed name in the object model
     void                update_name_in_model(const wxDataViewItem& item) const;
-    void                update_extruder_values_for_items(const int max_extruder);
+    void                update_extruder_values_for_items(const size_t max_extruder);
 
     void                init_icons();
     void                msw_rescale_icons();

src/slic3r/GUI/Plater.cpp

@@ -883,7 +883,7 @@ void Sidebar::init_filament_combo(PresetComboBox **combo, const int extr_idx) {
     sizer_filaments->Add(combo_and_btn_sizer, 1, wxEXPAND | wxBOTTOM, 1);
 }
 
-void Sidebar::remove_unused_filament_combos(const int current_extruder_count)
+void Sidebar::remove_unused_filament_combos(const size_t current_extruder_count)
 {
     if (current_extruder_count >= p->combos_filament.size())
         return;
@@ -926,9 +926,9 @@ void Sidebar::update_presets(Preset::Type preset_type)
     switch (preset_type) {
     case Preset::TYPE_FILAMENT:
     {
-        const int extruder_cnt = print_tech != ptFFF ? 1 :
+        const size_t extruder_cnt = print_tech != ptFFF ? 1 :
                                 dynamic_cast<ConfigOptionFloats*>(preset_bundle.printers.get_edited_preset().config.option("nozzle_diameter"))->values.size();
-        const int filament_cnt = p->combos_filament.size() > extruder_cnt ? extruder_cnt : p->combos_filament.size();
+        const size_t filament_cnt = p->combos_filament.size() > extruder_cnt ? extruder_cnt : p->combos_filament.size();
 
         if (filament_cnt == 1) {
             // Single filament printer, synchronize the filament presets.
@@ -1051,7 +1051,7 @@ wxButton* Sidebar::get_wiping_dialog_button()
     return p->frequently_changed_parameters->get_wiping_dialog_button();
 }
 
-void Sidebar::update_objects_list_extruder_column(int extruders_count)
+void Sidebar::update_objects_list_extruder_column(size_t extruders_count)
 {
     p->object_list->update_objects_list_extruder_column(extruders_count);
 }
@@ -4684,7 +4684,7 @@ void Plater::undo_redo_topmost_string_getter(const bool is_undo, std::string& ou
     out_text = "";
 }
 
-void Plater::on_extruders_change(int num_extruders)
+void Plater::on_extruders_change(size_t num_extruders)
 {
     auto& choices = sidebar().combos_filament();
 
@@ -4693,7 +4693,7 @@ void Plater::on_extruders_change(int num_extruders)
 
     wxWindowUpdateLocker noUpdates_scrolled_panel(&sidebar()/*.scrolled_panel()*/);
 
-    int i = choices.size();
+    size_t i = choices.size();
     while ( i < num_extruders )
     {
         PresetComboBox* choice/*{ nullptr }*/;
@@ -4880,7 +4880,7 @@ void Plater::changed_objects(const std::vector<size_t>& object_idxs)
     if (object_idxs.empty())
         return;
 
-    for (int obj_idx : object_idxs)
+    for (size_t obj_idx : object_idxs)
     {
         if (obj_idx < p->model.objects.size())
             // recenter and re - align to Z = 0

src/slic3r/GUI/Plater.hpp

@@ -89,7 +89,7 @@ public:
     ~Sidebar();
 
     void init_filament_combo(PresetComboBox **combo, const int extr_idx);
-    void remove_unused_filament_combos(const int current_extruder_count);
+    void remove_unused_filament_combos(const size_t current_extruder_count);
     void update_all_preset_comboboxes();
     void update_presets(Slic3r::Preset::Type preset_type);
     void update_mode_sizer() const;
@@ -105,7 +105,7 @@ public:
 
     ConfigOptionsGroup*     og_freq_chng_params(const bool is_fff);
     wxButton*               get_wiping_dialog_button();
-    void                    update_objects_list_extruder_column(int extruders_count);
+    void                    update_objects_list_extruder_column(size_t extruders_count);
     void                    show_info_sizer();
     void                    show_sliced_info_sizer(const bool show);
     void                    enable_buttons(bool enable);
@@ -209,7 +209,7 @@ public:
     void enter_gizmos_stack();
     void leave_gizmos_stack();
 
-    void on_extruders_change(int extruders_count);
+    void on_extruders_change(size_t extruders_count);
     void on_config_change(const DynamicPrintConfig &config);
     // On activating the parent window.
     void on_activate();

src/slic3r/GUI/PresetBundle.cpp

@@ -366,7 +366,7 @@ void PresetBundle::load_selections(const AppConfig &config, const std::string &p
     this->filament_presets = { filaments.get_selected_preset_name() };
     for (unsigned int i = 1; i < 1000; ++ i) {
         char name[64];
-        sprintf(name, "filament_%d", i);
+        sprintf(name, "filament_%u", i);
         if (! config.has("presets", name))
             break;
         this->filament_presets.emplace_back(remove_ini_suffix(config.get("presets", name)));
@@ -388,11 +388,12 @@ void PresetBundle::export_selections(AppConfig &config)
     config.clear_section("presets");
     config.set("presets", "print",        prints.get_selected_preset_name());
     config.set("presets", "filament",     filament_presets.front());
-	for (int i = 1; i < filament_presets.size(); ++i) {
+    for (unsigned i = 1; i < filament_presets.size(); ++i) {
         char name[64];
-        sprintf(name, "filament_%d", i);
+        sprintf(name, "filament_%u", i);
         config.set("presets", name, filament_presets[i]);
     }
+
     config.set("presets", "sla_print",    sla_prints.get_selected_preset_name());
     config.set("presets", "sla_material", sla_materials.get_selected_preset_name());
     config.set("presets", "printer",      printers.get_selected_preset_name());
@@ -779,7 +780,7 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool
                 Preset *loaded = nullptr;
                 if (is_external)
                     loaded = &this->filaments.load_external_preset(name_or_path, name,
-                        (i < old_filament_profile_names->values.size()) ? old_filament_profile_names->values[i] : "",
+                        (i < int(old_filament_profile_names->values.size())) ? old_filament_profile_names->values[i] : "",
                         std::move(cfg), i == 0);
                 else {
                     // Used by the config wizard when creating a custom setup.
@@ -1262,7 +1263,7 @@ void PresetBundle::update_multi_material_filament_presets()
 
     // Now verify if wiping_volumes_matrix has proper size (it is used to deduce number of extruders in wipe tower generator):
     std::vector<double> old_matrix = this->project_config.option<ConfigOptionFloats>("wiping_volumes_matrix")->values;
-    size_t old_number_of_extruders = int(sqrt(old_matrix.size())+EPSILON);
+    size_t old_number_of_extruders = size_t(sqrt(old_matrix.size())+EPSILON);
     if (num_extruders != old_number_of_extruders) {
             // First verify if purging volumes presets for each extruder matches number of extruders
             std::vector<double>& extruders = this->project_config.option<ConfigOptionFloats>("wiping_volumes_extruders")->values;

src/slic3r/GUI/Tab.cpp

@@ -232,7 +232,7 @@ void Tab::create_preset_tab()
         //! select_preset(m_presets_choice->GetStringSelection().ToUTF8().data());
         //! we doing next:
         int selected_item = m_presets_choice->GetSelection();
-        if (m_selected_preset_item == selected_item && !m_presets->current_is_dirty())
+        if (m_selected_preset_item == size_t(selected_item) && !m_presets->current_is_dirty())
             return;
         if (selected_item >= 0) {
             std::string selected_string = m_presets_choice->GetString(selected_item).ToUTF8().data();
@@ -489,7 +489,7 @@ template<class T>
 void add_correct_opts_to_options_list(const std::string &opt_key, std::map<std::string, int>& map, Tab *tab, const int& value)
 {
     T *opt_cur = static_cast<T*>(tab->m_config->option(opt_key));
-    for (int i = 0; i < opt_cur->values.size(); i++)
+    for (size_t i = 0; i < opt_cur->values.size(); i++)
         map.emplace(opt_key + "#" + std::to_string(i), value);
 }
 
@@ -1808,7 +1808,7 @@ void TabPrinter::build_fff()
         optgroup->append_single_option_line("single_extruder_multi_material");
 
         optgroup->m_on_change = [this, optgroup](t_config_option_key opt_key, boost::any value) {
-            size_t extruders_count = boost::any_cast<int>(optgroup->get_value("extruders_count"));
+            size_t extruders_count = boost::any_cast<size_t>(optgroup->get_value("extruders_count"));
             wxTheApp->CallAfter([this, opt_key, value, extruders_count]() {
                 if (opt_key == "extruders_count" || opt_key == "single_extruder_multi_material") {
                     extruders_count_changed(extruders_count);
@@ -2228,7 +2228,7 @@ void TabPrinter::build_unregular_pages()
 
     // Add/delete Kinematics page according to is_marlin_flavor
     size_t existed_page = 0;
-    for (int i = n_before_extruders; i < m_pages.size(); ++i) // first make sure it's not there already
+    for (size_t i = n_before_extruders; i < m_pages.size(); ++i) // first make sure it's not there already
         if (m_pages[i]->title().find(_(L("Machine limits"))) != std::string::npos) {
             if (!is_marlin_flavor || m_rebuild_kinematics_page)
                 m_pages.erase(m_pages.begin() + i);
@@ -2253,7 +2253,7 @@ void TabPrinter::build_unregular_pages()
         (m_has_single_extruder_MM_page && m_extruders_count == 1))
     {
         // if we have a single extruder MM setup, add a page with configuration options:
-        for (int i = 0; i < m_pages.size(); ++i) // first make sure it's not there already
+        for (size_t i = 0; i < m_pages.size(); ++i) // first make sure it's not there already
             if (m_pages[i]->title().find(_(L("Single extruder MM setup"))) != std::string::npos) {
                 m_pages.erase(m_pages.begin() + i);
                 break;
@@ -2399,8 +2399,8 @@ void TabPrinter::on_preset_loaded()
 {
     // update the extruders count field
     auto   *nozzle_diameter = dynamic_cast<const ConfigOptionFloats*>(m_config->option("nozzle_diameter"));
-    int extruders_count = nozzle_diameter->values.size();
+    size_t extruders_count = nozzle_diameter->values.size();
-    set_value("extruders_count", extruders_count);
+    set_value("extruders_count", int(extruders_count));
     // update the GUI field according to the number of nozzle diameters supplied
     extruders_count_changed(extruders_count);
 }
@@ -2538,7 +2538,7 @@ void TabPrinter::update_fff()
             DynamicPrintConfig new_conf = *m_config;
             if (dialog.ShowModal() == wxID_YES) {
                 auto wipe = static_cast<ConfigOptionBools*>(m_config->option("wipe")->clone());
-                for (int w = 0; w < wipe->values.size(); w++)
+                for (size_t w = 0; w < wipe->values.size(); w++)
                     wipe->values[w] = false;
                 new_conf.set_key_value("wipe", wipe);
             }

src/slic3r/GUI/wxExtensions.cpp

@@ -940,7 +940,7 @@ wxDataViewItem ObjectDataViewModel::Delete(const wxDataViewItem &item)
             // node can be deleted by the Delete, let's check its type while we safely can
             bool is_instance_root = (node->m_type & itInstanceRoot);
 
-            for (int i = node->GetChildCount() - 1; i >= (is_instance_root ? 1 : 0); i--)
+            for (int i = int(node->GetChildCount() - 1); i >= (is_instance_root ? 1 : 0); i--)
                 Delete(wxDataViewItem(node->GetNthChild(i)));
 
             return parent;
@@ -1020,7 +1020,7 @@ wxDataViewItem ObjectDataViewModel::Delete(const wxDataViewItem &item)
         {
             int vol_cnt = 0;
             int vol_idx = 0;
-            for (int i = 0; i < node_parent->GetChildCount(); ++i) {
+            for (size_t i = 0; i < node_parent->GetChildCount(); ++i) {
                 if (node_parent->GetNthChild(i)->GetType() == itVolume) {
                     vol_idx = i;
                     vol_cnt++;
@@ -1059,7 +1059,7 @@ wxDataViewItem ObjectDataViewModel::Delete(const wxDataViewItem &item)
 	else
 	{
 		auto it = find(m_objects.begin(), m_objects.end(), node);
-		auto id = it - m_objects.begin();
+        size_t id = it - m_objects.begin();
 		if (it != m_objects.end())
 		{
             // Delete all sub-items
@@ -1230,7 +1230,7 @@ void ObjectDataViewModel::DeleteSettings(const wxDataViewItem& parent)
 
 wxDataViewItem ObjectDataViewModel::GetItemById(int obj_idx)
 {
-	if (obj_idx >= m_objects.size())
+    if (size_t(obj_idx) >= m_objects.size())
 	{
 		printf("Error! Out of objects range.\n");
 		return wxDataViewItem(0);
@@ -1241,7 +1241,7 @@ wxDataViewItem ObjectDataViewModel::GetItemById(int obj_idx)
 
 wxDataViewItem ObjectDataViewModel::GetItemByVolumeId(int obj_idx, int volume_idx)
 {
-	if (obj_idx >= m_objects.size() || obj_idx < 0) {
+    if (size_t(obj_idx) >= m_objects.size()) {
 		printf("Error! Out of objects range.\n");
 		return wxDataViewItem(0);
 	}
@@ -1265,7 +1265,7 @@ wxDataViewItem ObjectDataViewModel::GetItemByVolumeId(int obj_idx, int volume_id
 
 wxDataViewItem ObjectDataViewModel::GetItemById(const int obj_idx, const int sub_obj_idx, const ItemType parent_type)
 {
-    if (obj_idx >= m_objects.size() || obj_idx < 0) {
+    if (size_t(obj_idx) >= m_objects.size()) {
         printf("Error! Out of objects range.\n");
         return wxDataViewItem(0);
     }
@@ -1294,7 +1294,7 @@ wxDataViewItem ObjectDataViewModel::GetItemByLayerId(int obj_idx, int layer_idx)
 
 wxDataViewItem ObjectDataViewModel::GetItemByLayerRange(const int obj_idx, const t_layer_height_range& layer_range)
 {
-    if (obj_idx >= m_objects.size() || obj_idx < 0) {
+    if (size_t(obj_idx) >= m_objects.size()) {
         printf("Error! Out of objects range.\n");
         return wxDataViewItem(0);
     }
@@ -1411,13 +1411,13 @@ int ObjectDataViewModel::GetRowByItem(const wxDataViewItem& item) const
 
     int row_num = 0;
     
-    for (int i = 0; i < m_objects.size(); i++)
+    for (size_t i = 0; i < m_objects.size(); i++)
     {
         row_num++;
         if (item == wxDataViewItem(m_objects[i]))
             return row_num;
 
-        for (int j = 0; j < m_objects[i]->GetChildCount(); j++)
+        for (size_t j = 0; j < m_objects[i]->GetChildCount(); j++)
         {
             row_num++;
             ObjectDataViewModelNode* cur_node = m_objects[i]->GetNthChild(j);
@@ -1429,7 +1429,7 @@ int ObjectDataViewModel::GetRowByItem(const wxDataViewItem& item) const
             if (cur_node->m_type == itInstanceRoot)
             {
                 row_num++;
-                for (int t = 0; t < cur_node->GetChildCount(); t++)
+                for (size_t t = 0; t < cur_node->GetChildCount(); t++)
                 {
                     row_num++;
                     if (item == wxDataViewItem(cur_node->GetNthChild(t)))
@@ -1503,7 +1503,7 @@ bool ObjectDataViewModel::SetValue(const wxVariant &variant, const wxDataViewIte
 
 bool ObjectDataViewModel::SetValue(const wxVariant &variant, const int item_idx, unsigned int col)
 {
-	if (item_idx < 0 || item_idx >= m_objects.size())
+    if (size_t(item_idx) >= m_objects.size())
 		return false;
 
 	return m_objects[item_idx]->SetValue(variant, col);
@@ -1662,7 +1662,7 @@ wxDataViewItem ObjectDataViewModel::GetItemByType(const wxDataViewItem &parent_i
     if (node->GetChildCount() == 0)
         return wxDataViewItem(0);
 
-    for (int i = 0; i < node->GetChildCount(); i++) {
+    for (size_t i = 0; i < node->GetChildCount(); i++) {
         if (node->GetNthChild(i)->m_type == type)
             return wxDataViewItem((void*)node->GetNthChild(i));
     }
@@ -2145,7 +2145,7 @@ void DoubleSlider::draw_scroll_line(wxDC& dc, const int lower_pos, const int hig
     wxCoord segm_end_x = is_horizontal() ? higher_pos : width*0.5 - 1;
     wxCoord segm_end_y = is_horizontal() ? height*0.5 - 1 : higher_pos-1;
 
-    for (int id = 0; id < m_line_pens.size(); id++)
+    for (size_t id = 0; id < m_line_pens.size(); id++)
     {
         dc.SetPen(*m_line_pens[id]);
         dc.DrawLine(line_beg_x, line_beg_y, line_end_x, line_end_y);
@@ -2494,7 +2494,7 @@ void DoubleSlider::draw_colored_band(wxDC& dc)
     dc.SetBrush(clr);
     dc.DrawRectangle(main_band);
 
-    int i = 1;
+    size_t i = 1;
     for (auto tick : m_ticks)
     {
         if (i == colors_cnt)