Merge upstream/main into belt-printer

Brings the belt-printer work up to date with 591 upstream commits.

Conflict resolutions (12 files, 42 hunks):

- GCode.cpp: adopted upstream's per-filament/per-nozzle config refactor
  (get_filament_config_index, NOZZLE_CONFIG), the extracted
  generate_timelapse_gcode + farthest-point timelapse, and the
  ConfigOptionFloatsNullable calibration options. Re-applied the belt
  hooks on top: init_belt_writer / axis remap / FirstLayerPlane setup,
  on_set_origin, the belt-corrected calib_z for the volumetric speed
  tower, and path_on_first_layer (belt's per-path first-layer test) in
  place of upstream's layer-index on_first_layer() in the acceleration,
  jerk and overhang-detection paths. Swept upstream's new m_writer.
  uses to m_writer-> since belt holds the writer by unique_ptr.
- interpolate_value_across_layers: kept upstream's banded stepping and
  belt's object-Z-span ratio; dropped upstream's duplicate ratio decl.
- Plater.cpp: took upstream's guarded add_model(...) early-returns and
  the VFA vfa_layer_height plumbing; kept the belt temp-tower path,
  _calib_apply_belt_mode and belt_calib_flip_ringing_tower. Dropped the
  VFA "cut upper" block, superseded upstream by model scaling.
- Brim.cpp: upstream's ObjectInstanceID-keyed brimAreaMap, keeping the
  belt early-return.
- 3DScene.cpp: kept both the belt build-plate tilt up_direction and
  upstream's per-extruder printable-height shading.
- GCodeViewer.cpp: kept upstream's dim-previous-layers setup and belt's
  exemption from the same-result early return.
- TreeSupport.cpp: upstream's >= 0 roof-layer fix inside belt's
  belt-floor branch.
- calib.cpp / GCode.hpp / GCodeWriter.{cpp,hpp} / Print.hpp: upstream's
  additions adapted to belt's pointer-held writer and helpers.
- Custom.json: kept profile version 02.04.00.03 (belt) over upstream's
  02.04.00.01; both bumped from 02.04.00.00.

Building this tree needs the wxInspector dependency, which upstream
added in the interim (python3 and wxWidgets 3.3.2 were already present
in the shared deps prefix).

src/slic3r/GUI/GCodeViewer.cpp

@@ -447,7 +447,7 @@ void GCodeViewer::SequentialView::Marker::render_position_window(const libvgcode
             add_row(_u8L("Flow rate"), buff);
             sprintf(buff, "%.0f %%", vertex.fan_speed);
             add_row(_u8L("Fan speed"), buff);
-            sprintf(buff, ("%.0f " + _u8L("°C")).c_str(), vertex.temperature);
+            sprintf(buff, ("%.0f " + _u8L("\u2103" /* °C */)).c_str(), vertex.temperature);
             add_row(_u8L("Temperature"), buff);
             sprintf(buff, "%.4f", vertex.pressure_advance);
             add_row(_u8L("Pressure Advance"), buff);
@@ -491,7 +491,7 @@ void GCodeViewer::SequentialView::Marker::render_position_window(const libvgcode
         const float main_row_h     = 2.0f * text_h + item_spacing_y; // Two lines of text (position and detail) + spacing between them
         const float properties_h   = static_cast<float>(properties_rows.size()) * (text_h + 2.0f * cell_pad_y) +  2.0f * cell_pad_y + 1.0f + item_spacing_y // table rows
                                     + item_spacing_y + show_button_h                    // Spacing() + Show/Hide button row
-                                    + item_spacing_y + 1.0f + style.FramePadding.y;     // Spacing() + Separator() + Dummy()
+                                    + item_spacing_y + 1.0f + style.WindowPadding.y;    // Spacing() + Separator() + Dummy()
         const float folded_window_h   = std::ceil(window_pad_h + main_row_h);           // Height of the window when properties are hidden, with padding, rounded up for better look
         const float unfolded_window_h = std::ceil(folded_window_h + properties_h);      // Height of the window when properties are shown, with padding, rounded up for better look
         const float window_h = properties_shown ? unfolded_window_h : folded_window_h;  // Final window height depending on whether properties are shown or not
@@ -617,9 +617,12 @@ void GCodeViewer::SequentialView::Marker::render_position_window(const libvgcode
 
             ImGui::Spacing();
             ImGui::Separator();
-            ImGui::Dummy({0, style.FramePadding.y});
+            ImGui::Dummy({0, style.WindowPadding.y});
         }
 
+        float draw_area_height = ImGui::GetTextLineHeight() * 2.f + style.ItemSpacing.y;
+        ImGui::Dummy({10.f, draw_area_height}); // reserve area
+
         ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding  , 3.f * m_scale);
         ImGui::PushStyleVar(ImGuiStyleVar_FramePadding   , ImVec2(2.f, 2.f) * m_scale);
         ImGui::PushStyleColor(ImGuiCol_Button            , ImVec4(0, 0, 0, 0));
@@ -627,6 +630,10 @@ void GCodeViewer::SequentialView::Marker::render_position_window(const libvgcode
         ImGui::PushStyleColor(ImGuiCol_ButtonActive      , ImVec4(84 / 255.f, 84 / 255.f, 90 / 255.f, 1.f));
          
         const float main_wnd_height = ImGui::GetWindowHeight();
+        const float draw_start_y = main_wnd_height - draw_area_height - style.WindowPadding.y;
+
+        ImGui::SetCursorPos(ImVec2(style.WindowPadding.x, draw_start_y));
+
         // ORCA use glyph based button for fixing button sizes changing depends on used font size on platform
         const wchar_t foldIcon = properties_shown ? ImGui::UnfoldButtonIcon : ImGui::FoldButtonIcon;
         if (imgui.glyph_button(foldIcon, ImVec2(16.f, 16.f) * m_scale)) {
@@ -642,10 +649,7 @@ void GCodeViewer::SequentialView::Marker::render_position_window(const libvgcode
         ImGui::PopStyleColor(3);
         ImGui::PopStyleVar(2);
 
-        ImGui::SameLine();
-
-        if(!properties_shown)
-            ImGui::SetCursorPosY(ImGui::GetCursorPosY() - style.FramePadding.y); // aligns button with next group
+        ImGui::SetCursorPos(ImVec2(style.WindowPadding.x + style.ItemSpacing.x + 24.f * m_scale, draw_start_y - 1.f * m_scale));
 
         ImGui::BeginGroup(); // group contents to make information area more compact
 
@@ -1193,6 +1197,10 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
     if (current_top_layer_only != required_top_layer_only)
         m_viewer.toggle_top_layer_only_view_range();
 
+    // ORCA: darken the layers the preview layer slider is not scrubbed to
+    m_viewer.set_dim_previous_layers(get_app_config()->get_bool("preview_dim_previous_layers"));
+    m_viewer.set_dim_previous_layers_brightness(0.01f * std::stoi(get_app_config()->get("preview_dim_previous_layers_brightness")));
+
     // avoid processing if called with the same gcode_result.
     // Belt printers are exempt: the toolpath geometry fed to libvgcode depends on
     // the current designed/raw view state (back-transform applied in convert), so
@@ -3092,8 +3100,11 @@ void GCodeViewer::render_legend_color_arr_recommen(float window_padding)
 
     float delta_weight_to_single_ext = stats_by_extruder.stats_by_single_extruder.filament_flush_weight - stats_by_extruder.stats_by_multi_extruder_curr.filament_flush_weight;
     float delta_weight_to_best = stats_by_extruder.stats_by_multi_extruder_curr.filament_flush_weight - stats_by_extruder.stats_by_multi_extruder_best.filament_flush_weight;
-    int   delta_change_to_single_ext = stats_by_extruder.stats_by_single_extruder.filament_change_count - stats_by_extruder.stats_by_multi_extruder_curr.filament_change_count;
-    int   delta_change_to_best = stats_by_extruder.stats_by_multi_extruder_curr.filament_change_count - stats_by_extruder.stats_by_multi_extruder_best.filament_change_count;
+    // The displayed "hand changes" delta uses the per-nozzle flush_filament_change_count.
+    // For single-nozzle-per-extruder printers it equals the per-extruder filament_change_count,
+    // so the shown value is unchanged.
+    int   delta_change_to_single_ext = stats_by_extruder.stats_by_single_extruder.flush_filament_change_count - stats_by_extruder.stats_by_multi_extruder_curr.flush_filament_change_count;
+    int   delta_change_to_best = stats_by_extruder.stats_by_multi_extruder_curr.flush_filament_change_count - stats_by_extruder.stats_by_multi_extruder_best.flush_filament_change_count;
 
     bool any_less_to_single_ext = delta_weight_to_single_ext > EPSILON || delta_change_to_single_ext > 0;
     bool any_more_to_best = delta_weight_to_best > EPSILON || delta_change_to_best > 0;
@@ -3885,7 +3896,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
         break;
     }
     case libvgcode::EViewType::FanSpeed:       { imgui.title(_u8L("Fan speed (%)")); break; }
-    case libvgcode::EViewType::Temperature:    { imgui.title(_u8L("Temperature (°C)")); break; }
+    case libvgcode::EViewType::Temperature:    { imgui.title(_u8L("Temperature (℃)")); break; }
 // ORCA: Add Pressure Advance visualization support
     case libvgcode::EViewType::PressureAdvance:{ imgui.title(_u8L("Pressure Advance")); break; }
     case libvgcode::EViewType::VolumetricFlowRate:
@@ -4439,7 +4450,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
         };
 
         auto append_print = [&imgui, imperial_units](const ColorRGBA& color, const std::array<float, 4>& offsets, const Times& times, std::pair<double, double> used_filament) {
-            imgui.text(_u8L("Print"));
+            imgui.text(_u8L_CONTEXT("Print", "Noun"));
             ImGui::SameLine();
 
             float icon_size = ImGui::GetTextLineHeight();
@@ -4473,7 +4484,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
             for (const PartialTime& item : partial_times) {
                 switch (item.type)
                 {
-                case PartialTime::EType::Print:       { labels.push_back(_u8L("Print")); break; }
+                case PartialTime::EType::Print:       { labels.push_back(_u8L_CONTEXT("Print", "Noun")); break; }
                 case PartialTime::EType::Pause:       { labels.push_back(_u8L("Pause")); break; }
                 case PartialTime::EType::ColorChange: { labels.push_back(_u8L("Color change")); break; }
                 }