clean up comments

src/slic3r/GUI/ConfigManipulation.cpp

@@ -577,13 +577,9 @@ void ConfigManipulation::update_print_fff_config(DynamicPrintConfig* config, con
     }
 
     // BBS
-    // A filament override naming a slot that no longer exists is stale and falls back to the
-    // plater's value. Support and the wipe tower are additionally restricted to physical filaments:
-    // the engine consumes those keys directly, with no per-layer mixed resolution, so a virtual
-    // slot there would reach the G-code unresolved. The per-feature keys have no such restriction —
-    // LayerTools::extruder() and its siblings resolve a mixed slot to the physical filament chosen
-    // for each layer. The sidebar dropdowns already hide mixed slots for the restricted keys
-    // (Plater.cpp DynamicFilamentList); this reset covers values loaded from projects.
+    // Reset filament overrides pointing at a slot that no longer exists. Support and the wipe
+    // tower additionally reject mixed slots: the engine consumes those keys directly, so a virtual
+    // slot would reach the G-code unresolved, while the per-feature keys are resolved per layer.
     static const char* physical_only_keys[] = { "support_filament", "support_interface_filament", "wipe_tower_filament" };
     static const char* feature_keys[] = { "outer_wall_filament_id", "inner_wall_filament_id",
                                           "sparse_infill_filament_id", "internal_solid_filament_id",

src/slic3r/GUI/FilamentBitmapUtils.cpp

@@ -131,8 +131,7 @@ void fill_gradient_ramp_rect(wxDC& dc, const wxRect& rect, const std::vector<wxC
     dc.SetPen(*wxTRANSPARENT_PEN);
     for (int y = 0; y < rect.height; ++y) {
         // Row 0 is the top of the rect and so takes the ramp's last entry, the model's top.
-        // Mapping over height - 1 keeps both ends of the ramp on screen; a swatch is often
-        // shorter than the ramp is long, so truncating either end would be visible.
+        // Mapping over height - 1 puts both ends of the ramp on screen even in a short swatch.
         const double t = (rect.height > 1) ? (double) (rect.height - 1 - y) / (rect.height - 1) : 0.5;
         dc.SetBrush(wxBrush(ramp[static_cast<size_t>(t * (ramp.size() - 1) + 0.5)]));
         dc.DrawRectangle(rect.x, rect.y + y, rect.width, 1);

src/slic3r/GUI/FilamentBitmapUtils.hpp

@@ -38,19 +38,17 @@ wxColour blend_n_colors(const std::vector<wxColour>& cols, const std::vector<dou
 
 // Sample a gradient mixed filament the way the slicer builds it: t runs 0..1 over the
 // model's height, the curve gives the first component's ratio at t, and the two
-// components are blended at that ratio. Entry 0 is the bottom of the model, the last
-// entry its top. Blending goes through blend_n_colors, so measured mixes and the
-// reserved [kGradientMinRatio, kGradientMaxRatio] band are both respected — a plain
-// two-endpoint fade is neither.
+// components are blended at that ratio through blend_n_colors. Entry 0 is the bottom
+// of the model, the last entry its top.
 std::vector<wxColour> sample_gradient_ramp(const wxColour& first,
                                            const wxColour& second,
                                            const Slic3r::GradientCurve& curve,
                                            int steps);
 
 // Same ramp for a project config slot, resolving components, colours and curve (or the
-// linear gradient_range fallback) from cfg. Empty unless the slot is a two-component
-// gradient mixed filament, which is what gates every caller to mixed slots only.
-// steps is the ramp's resolution; pass the destination's height in pixels.
+// linear gradient_range fallback) from cfg. Returns empty for any slot that is not a
+// two-component gradient mixed filament. steps is the ramp's resolution; pass the
+// destination's height in pixels.
 std::vector<wxColour> mixed_gradient_ramp(const Slic3r::DynamicPrintConfig& cfg, size_t slot, int steps);
 
 // Fill rect with a ramp, ramp.front() along the bottom edge.

src/slic3r/GUI/GLCanvas3D.cpp

@@ -9681,10 +9681,9 @@ void GLCanvas3D::_render_paint_toolbar() const
             }
         }
     }
-    // ORCA: the loop above only produces a label for a slot whose preset is found in the preset
-    // collection, while the render loop below iterates extruder_num (= colour count). Pad the
-    // label arrays so a slot without a matching preset cannot index past them — reading a garbage
-    // std::string here crashes in ImGui::CalcTextSize (strlen).
+    // ORCA: the loop above only labels a slot whose preset was found in the preset collection,
+    // while the render loop below iterates extruder_num. Pad the label arrays so a slot without a
+    // matching preset cannot index past them; a garbage std::string crashes ImGui::CalcTextSize.
     while (int(filament_text_first_line.size()) < extruder_num) {
         filament_text_first_line.emplace_back();
         filament_text_second_line.emplace_back();

src/slic3r/GUI/GUI_App.cpp

@@ -8906,9 +8906,9 @@ void GUI_App::load_current_presets(bool active_preset_combox/*= false*/, bool ch
         auto* nozzle_diameter = edited_printer_preset.config.option<ConfigOptionFloats>("nozzle_diameter");
         if (nozzle_diameter) {
             // Mixed-color slots are virtual filaments kept at the tail of the list, so they have no
-            // nozzle of their own. Sizing to the nozzle count alone truncates them away — and this
-            // runs right after a project is loaded, so it would silently drop the project's mixes
-            // and then let update_extruder_count() strip every painted facet above the new count.
+            // nozzle of their own. Sizing to the nozzle count alone would silently drop the mixes of
+            // a just-loaded project, and update_extruder_count() would then strip the facets painted
+            // with them.
             preset_bundle->set_num_filaments(nozzle_diameter->values.size() + preset_bundle->num_mixed_filaments());
         }
     }

src/slic3r/GUI/GUI_ObjectList.cpp

@@ -3234,8 +3234,8 @@ void ObjectList::merge(bool to_multipart_object)
 void ObjectList::layers_editing()
 {
     // Height ranges give each range its own layer height, varying the mixed sub-layer heights just
-    // like an adaptive profile; sibling of the on_action_layersediting/ConfigManipulation warnings,
-    // sharing the same do-not-show-again flag.
+    // like an adaptive profile, so this raises the same warning as variable layer height and shares
+    // its do-not-show-again flag.
     const auto& print_config = wxGetApp().preset_bundle->prints.get_edited_preset().config;
     if (print_config.opt_bool("enable_mixed_color_sublayer")) {
         if (wxGetApp().app_config->get("no_warn_mixed_sublayer_variable_layer") != "1") {

src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp

@@ -326,10 +326,9 @@ bool GLGizmoMmuSegmentation::draw_color_button(int idx, const char* id_str, cons
     bool dark_tone = gradient ? (*gradient)[gradient->size() / 2].GetLuminance() < 0.51 :
                                 (0.299f * color.r() + 0.587f * color.g() + 0.114f * color.b()) < 0.51f; // matching values used by wxWidgets with clr.GetLuminance() < 0.51
 
-    // Paint a gradient mixed filament's fade before the button and keep the button transparent, so the
-    // slot number and the frame below stay on top of it. The bands cannot round their corners, so the
-    // fade is drawn at the frame's inset and the frame masks it into the same shape a plain color slot
-    // gets.
+    // Paint a gradient mixed filament's fade before the button and keep the button transparent, so
+    // the slot number and the frame below stay on top of it. The bands cannot round their corners,
+    // so the fade is inset to the frame, which masks it into the shape a plain color slot gets.
     if (gradient) {
         ImGuiWrapper::draw_gradient_ramp(draw_list, {pos.x + frame_inset * scale, pos.y + frame_inset * scale},
                                          {pos.x + size.x - frame_inset * scale, pos.y + size.y - frame_inset * scale}, *gradient);
@@ -778,7 +777,7 @@ void GLGizmoMmuSegmentation::update_triangle_selectors_colors()
         TriangleSelectorPatch* selector = dynamic_cast<TriangleSelectorPatch*>(m_triangle_selectors[i].get());
         int extruder_idx = m_volumes_extruder_idxs[i];
         int extruder_color_idx = std::max(0, extruder_idx - 1);
-        // As above: a mixed-color slot can index past the physical colour list.
+        // A mixed-color slot can index past the physical colour list; fall back to the first colour.
         if (extruder_color_idx >= (int)m_extruders_colors.size())
             extruder_color_idx = 0;
         std::vector<ColorRGBA> ebt_colors;

src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.hpp

@@ -142,7 +142,7 @@ private:
     // ORCA
     bool draw_color_button(int idx, const char* id_str, const ColorRGBA& color, ColorRGBA& map_color, bool active, float scale);
     // Gradient ramp of a filament slot, or nullptr when the slot is a plain single color
-    // filament, so callers can index into what they get back freely.
+    // filament. A non-null result is never empty.
     const std::vector<wxColour>* gradient_of(int idx) const
     {
         return idx >= 0 && idx < (int) m_gradient_ramps.size() && !m_gradient_ramps[idx].empty() ? &m_gradient_ramps[idx] : nullptr;

src/slic3r/GUI/Gizmos/GLGizmosManager.cpp

@@ -998,8 +998,8 @@ bool GLGizmosManager::on_key(wxKeyEvent& evt)
                     keyCode = keyCode- WXK_NUMPAD0+'0';
                 }
                 if (keyCode >= '0' && keyCode <= '9') {
-                    // The paint palette now reaches EXTRUDERS_LIMIT (mixed-color filaments share
-                    // the same slots), so any leading digit that can start a valid two-digit
+                    // The paint palette reaches EXTRUDERS_LIMIT slots (mixed-color filaments take
+                    // ordinary slots too), so any leading digit that can start a valid two-digit
                     // number waits briefly for a second one.
                     const int digit        = keyCode - '0';
                     const int shortcut_max = int(GLGizmoMmuSegmentation::EXTRUDERS_LIMIT);

src/slic3r/GUI/GradientCurveEditor.cpp

@@ -19,7 +19,7 @@ namespace GUI {
 wxDEFINE_EVENT(wxEVT_GRADIENT_CURVE_CHANGED, wxCommandEvent);
 
 namespace {
-// Layout (Figma "Property 1=Default", 214.06 x 179.63 px reference).
+// Layout ratios of the plot rect within the widget, taken from a 214 x 180 px reference drawing.
 // Plot rect occupies the upper-left region; right + bottom margins host axis arrows / labels.
 constexpr double kPlotLeftRatio   = 0.0316;
 constexpr double kPlotRightRatio  = 0.6766;
@@ -37,7 +37,7 @@ constexpr int kStrokeAxis       = 2;   // axis line width (px, no DPI scaling -
 constexpr int kAxisArrowHalf    = 5;   // half-base of the axis arrow triangle (DIP)
 constexpr int kAxisArrowLen     = 10;  // length of the axis arrow triangle (DIP)
 
-// Light-mode design tokens from Figma. Resolved through StateColor::darkModeColorFor()
+// Light-mode design tokens. Resolved through StateColor::darkModeColorFor()
 // at paint time so the editor follows the app theme (#EEEEEE -> #4C4C55, #6B6B6B ->
 // #818183, #262E30 -> #EFEFF0, *wxWHITE -> #2D2D31). Don't read these directly in paint;
 // always go through the resolved locals declared at the top of on_paint().
@@ -46,11 +46,9 @@ const wxColour kAxisColor   (107, 107, 107);   // #6B6B6B grey 700
 const wxColour kLabelMuted  (107, 107, 107);   // #6B6B6B grey 700
 const wxColour kLabelStrong ( 38,  46,  48);   // #262E30 grey 900
 
-// LAB (DeltaE76) threshold for "curve color is too close to the background". Below this
-// we paint a subtle axis-color outline so the curve doesn't visually vanish; above this
-// we draw the curve plain. ~15 is "perceptible but still close", looser than the strict
-// 5.0 used by FlushPredict::is_similar_color but loose enough that a pastel pink on white
-// or a charcoal on #2B2B2B still triggers an outline.
+// LAB (DeltaE76) threshold for "curve color is too close to the background": below it the curve
+// gets a subtle outline so it does not visually vanish, otherwise it is drawn plain. Looser than
+// the 5.0 of FlushPredict::is_similar_color, so a pastel pink on white still gets an outline.
 constexpr float kBgSimilarThreshold = 15.0f;
 constexpr int   kOutlineExtraDip    = 2;
 } // namespace
@@ -65,8 +63,6 @@ GradientCurveEditor::GradientCurveEditor(wxWindow* parent,
     SetBackgroundStyle(wxBG_STYLE_PAINT);
     SetBackgroundColour(wxGetApp().get_window_default_clr());
     // Wide enough so the X-axis "Material Ratio" label fits past the arrow tip without overlap.
-    // 260 (was 240): adds room for the "Material Ratio" label that gets shifted right by the
-    // longer axis arrow; the hosting MixedFilamentDialog grows to 470 DIP to accommodate.
     SetMinSize(FromDIP(wxSize(260, 200)));
 
     reset_to_linear(0.10, 0.90);
@@ -456,10 +452,9 @@ void GradientCurveEditor::on_paint(wxPaintEvent& /*evt*/)
         return poly;
     };
 
-    // Only the geometry goes through the graphics context: dc.DrawLines() takes integer
-    // wxPoint and would quantize the curve back to whole pixels.  The pen is still set on
-    // the dc, which forwards it to this same context while keeping the dc's own cached
-    // state in sync, so later dc drawing does not inherit the curve's pen.
+    // Only the geometry goes through the graphics context: dc.DrawLines() takes integer wxPoint
+    // and would quantize the curve back to whole pixels. The pen is still set on the dc, which
+    // forwards it here while keeping its own cached state in sync for later dc drawing.
     auto draw_polyline = [&](const std::vector<wxPoint2DDouble>& poly, const wxColour& col, int stroke_dip) {
         dc.SetPen(wxPen(col, FromDIP(stroke_dip)));
         gc->StrokeLines(poly.size(), poly.data());
@@ -552,12 +547,9 @@ void GradientCurveEditor::on_left_down(wxMouseEvent& evt)
 
     // 4) Selected curve line body hit -> insert a new anchor at cursor x (snapped
     //    to the current smooth curve so the initial click is visually invisible)
-    //    and immediately enter Anchor drag mode. PS Curves style: the drag-bend
-    //    interaction has no separate "bend without anchor" mode; pressing and
-    //    dragging on the line is equivalent to clicking to add then dragging the
-    //    fresh anchor. Trades the previous (failed) "no anchor on drag" promise
-    //    for genuine cursor tracking, since a single cubic between two existing
-    //    anchors mathematically cannot put its peak under an off-center cursor.
+    //    and immediately enter Anchor drag mode. Bending the segment without
+    //    inserting an anchor is not an option: a single cubic between two existing
+    //    anchors cannot put its peak under an off-center cursor.
     double nx = 0, dummy = 0;
     px_to_data(pos.x, pos.y, nx, dummy);
     if (nx <= 0.0 || nx >= 1.0 || seg < 0) {

src/slic3r/GUI/MixedFilamentDialog.cpp

@@ -894,9 +894,9 @@ wxBoxSizer* MixedFilamentDialog::create_ratio_slider()
         on_ratio_changed(std::max(MIN_COMPONENT_RATIO, std::min(100 - MIN_COMPONENT_RATIO, new_ratio)));
     });
 
-    // Release whenever the capture is held, not only when the drag flag is set:
-    // the flag can be cleared behind our back, and a capture that outlives the
-    // widget wedges mouse input for the whole application.
+    // Key the release off the capture itself, not off the drag flag: the two can fall out of
+    // sync (a lost capture clears the flag on its own), and a capture that outlives the widget
+    // wedges mouse input for the whole application.
     m_ratio_bar->Bind(wxEVT_LEFT_UP, [this](wxMouseEvent&) {
         m_ratio_dragging = false;
         if (m_ratio_bar->HasCapture())
@@ -1492,11 +1492,9 @@ void MixedFilamentDialog::on_ratio_changed(int new_ratio_a)
 
 void MixedFilamentDialog::on_gradient_toggled()
 {
-    // Orca: the engine only produces a gradient when the print profile's
-    // "enable_mixed_color_sublayer" option is on (ToolOrdering::resolve_mixed_filaments
-    // falls back to whole-layer round-robin without it, and BBS leaves users to find the
-    // option themselves). Offer to switch it on so the gradient the user just enabled
-    // actually shows up in the sliced result. Keep this block on future BBS syncs.
+    // Orca: a gradient is only sliced when the print profile's "enable_mixed_color_sublayer"
+    // option is on; without it ToolOrdering picks a single component per whole layer. Offer to
+    // turn the option on instead of silently ignoring the gradient the user just enabled.
     bool checked = m_chk_gradient->GetValue();
 
     if (checked) {

src/slic3r/GUI/PartPlate.cpp

@@ -2048,13 +2048,8 @@ bool PartPlate::check_tpu_printable_status(const DynamicPrintConfig & config, co
 }
 
 // A mixed-color filament alternates between its components constantly. On a single-nozzle
-// printer every one of those switches is a full filament change plus a purge, so warn the
-// user before they commit to it. Printers with more than one nozzle can keep the components
-// loaded simultaneously and are not affected.
-//
-// BBS additionally excludes its H2C/H2D/X2D models by name; those are multi-nozzle machines
-// already ruled out by the nozzle_diameter test above, so the name check is dropped here
-// rather than carried over as a Bambu-specific special case.
+// printer every one of those switches is a full filament change plus a purge, so warn before
+// slicing. Multi-nozzle printers keep the components loaded at once and are not affected.
 bool PartPlate::check_single_extruder_mixed_filament_risk(const DynamicPrintConfig &config, std::string &warning_text) const
 {
     warning_text.clear();

src/slic3r/GUI/PlateSettingsDialog.cpp

@@ -473,8 +473,7 @@ PlateSettingsDialog::PlateSettingsDialog(wxWindow* parent, const wxString& title
     m_sizer_main->Add(m_other_layers_seq_panel, 0, wxEXPAND | wxLEFT | wxRIGHT, FromDIP(30));
 
     // A mixed-color slot resolves to a different physical filament per layer, so a user-defined
-    // filament order cannot be honoured. Disable the choice and say why. BBS puts this warning
-    // inside its button sizer; Orca builds the buttons with DialogButtons, so it gets its own row.
+    // filament order cannot be honoured; grey out the choice and explain that in the dialog.
     {
         auto &proj_cfg     = wxGetApp().preset_bundle->project_config;
         auto *is_mixed_opt = proj_cfg.option<ConfigOptionBools>("filament_is_mixed");

src/slic3r/GUI/Plater.cpp

@@ -3876,10 +3876,8 @@ void Sidebar::change_top_border_for_mode_sizer(bool increase_border)
 
 
 // ---- Mixed-color filament sidebar support ----
-// Ported from BambuStudio's 混色耗材 feature. BBS hosts these widgets in an
-// m_filament_area_wrapper that Orca's sidebar has no counterpart for, so the mixed
-// section is parented to p->scrolled and sized with Orca's own row-height preference
-// (filaments_area_preferred_count) rather than BBS's fixed 3-row / 12-filament cap.
+// The mixed rows get their own scroll area, capped by Orca's filaments_area_preferred_count
+// row budget rather than BBS's fixed 3-row / 12-filament limit.
 void Sidebar::recalc_filament_scroll_sizes()
 {
     if (!p->m_mixed_scroll_area || !p->m_mixed_scroll_area->GetSizer())
@@ -4102,8 +4100,8 @@ void Sidebar::update_mixed_filament_list()
             unsigned int mix_num = (unsigned int)(cfg_idx + 1);
 
             // The swatch fades bottom to top over the model's height, sampled the same way
-            // the slicer builds the sublayers, so it matches the editor's Effect Preview. It
-            // comes back empty for every slot that is not a two component gradient mix.
+            // the slicer builds the sublayers, so it matches the editor's Effect Preview. The
+            // ramp comes back empty for every slot that is not a two component gradient mix.
             const int swatch_sz = FromDIP(20);
             const std::vector<wxColour> gradient_ramp = mixed_gradient_ramp(project_config, cfg_idx, swatch_sz);
 
@@ -4642,9 +4640,8 @@ static bool create_mixed_filament_from_result(
         multi_colour_opt->values[new_idx] = mixed_color;
     }
 
-    // set_num_filaments() above is what grows these parallel arrays. Guard the writes anyway,
-    // matching the gradient writes below, so a sizing bug degrades into a no-op rather than a
-    // heap overwrite.
+    // set_num_filaments() above already grows these parallel arrays; the writes are still
+    // size-guarded so a sizing bug degrades into a no-op rather than a heap overwrite.
     {
         auto* is_mixed_opt = project_config.option<ConfigOptionBools>("filament_is_mixed");
         while (is_mixed_opt->values.size() <= new_idx) is_mixed_opt->values.push_back(false);
@@ -14071,11 +14068,9 @@ bool Plater::priv::can_layers_editing() const
 
 void Plater::priv::on_action_layersediting(SimpleEvent&)
 {
-    // Sub-layer splitting divides each layer by the mix ratio, so an adaptive layer profile makes
-    // those sub-layer heights vary and degrades the blend. ConfigManipulation warns when the
-    // option is switched on with a variable profile already present; this is the other direction,
-    // warning when variable layer editing is switched on while the option is active. All three
-    // sites (with ObjectList::layers_editing for height ranges) honour the same do-not-show-again flag.
+    // Sub-layer splitting divides each layer by the mix ratio, so a variable layer height profile
+    // makes those sub-layer heights uneven and degrades the blend. ConfigManipulation warns for the
+    // opposite order, when the option is switched on while a variable profile already exists.
     if (!view3D->is_layers_editing_enabled()) {
         const auto& print_config = wxGetApp().preset_bundle->prints.get_edited_preset().config;
         if (print_config.opt_bool("enable_mixed_color_sublayer")) {
@@ -19988,14 +19983,11 @@ std::vector<std::string> Plater::get_filament_color_render_type() const
 
 const std::vector<std::vector<wxColour>>& Plater::get_filament_gradient_ramps() const
 {
-    // Sampling a ramp walks the measured-blend recipe table once per step, and the paint toolbar
-    // asks for the ramps on every rendered frame, so they are cached against the config values
-    // they are built from and resampled only when one of those actually changes.
-    //
-    // The cache cannot live on the Plater: the extruder icons ask for the ramps from inside
-    // MenuFactory::init(), which runs while this Plater is still being constructed, so `this` is
-    // not usable yet. Everything the ramps are built from is global anyway, and there is one
-    // Plater per process, which is the same reasoning behind the icons' own static BitmapCache.
+    // Sampling a ramp walks the measured-blend recipe table once per step and the paint toolbar
+    // asks for the ramps every rendered frame, so they are cached against the config values they
+    // are built from. The cache is static rather than a Plater member because the extruder icons
+    // ask for the ramps from MenuFactory::init(), which runs while this Plater is still inside its
+    // own constructor, so wxGetApp().plater_ is not assigned yet.
     static std::string                        s_ramps_key;
     static std::vector<std::vector<wxColour>> s_ramps;
 

src/slic3r/GUI/SyncAmsInfoDialog.cpp

@@ -2577,7 +2577,7 @@ void SyncAmsInfoDialog::reset_and_sync_ams_list()
     m_filaments.clear();
 
     // Mixed-color slots are virtual: they never occupy a tray, so they must not appear as
-    // AMS sync targets. Look the flags up once and skip those slots in the loop below.
+    // AMS sync targets.
     auto* is_mixed_opt = preset_bundle->project_config.option<ConfigOptionBools>("filament_is_mixed");
 
     bool use_double_extruder = get_is_double_extruder();
@@ -2801,7 +2801,7 @@ void SyncAmsInfoDialog::generate_override_fix_ams_list()
     m_fix_filaments.clear();
 
     // Mixed-color slots are virtual: they never occupy a tray, so they must not appear as
-    // AMS sync targets. Look the flags up once and skip those slots in the loop below.
+    // AMS sync targets.
     auto* is_mixed_opt = preset_bundle->project_config.option<ConfigOptionBools>("filament_is_mixed");
 
     bool use_double_extruder = get_is_double_extruder();

src/slic3r/GUI/TextureImportDialog.cpp

@@ -1368,11 +1368,9 @@ void TexturePreviewCanvas::ensure_gl_ready()
 {
     if (m_gl_initialized) return;
 
-    // BBS loads GL entry points here with GLEW. Orca uses glad and centralises loading in
-    // OpenGLManager, which has already run by the time any canvas is realized, so just
-    // verify the loader is up and drain any stale error state.
-    // glad leaves unresolved entry points as null pointers, so this is a cheap guard against
-    // painting before OpenGLManager::init_gl() has run.
+    // BBS loads the GL entry points here with GLEW; Orca loads them centrally in
+    // OpenGLManager, so only check that this has already happened (glad leaves unresolved
+    // entry points null) and drain any stale error state.
     if (glGetString == nullptr) {
         BOOST_LOG_TRIVIAL(error) << "TexturePreviewCanvas: OpenGL functions are not loaded yet";
         return;
@@ -2436,10 +2434,9 @@ void TextureImportDialog::start_computation(bool auto_color, bool initial)
     settings.target_colors_num = auto_color ? 0 : (size_t)m_param_color_count;
     settings.smooth_weight     = m_param_smooth / 10.0;
     settings.mesh_repair_decision = m_mesh_repair_decision;
-    // BBS repairs the mesh through the Windows 3D SDK, which only exists on Windows and only
-    // when the SDK is present at build time. Orca already ships a CGAL-based repair
-    // (MeshBoolean::cgal::repair) that works on all three platforms, so use that instead —
-    // this makes the repair path available on Linux and macOS too.
+    // BBS repairs the mesh through the Windows 3D SDK, which is only available on Windows
+    // builds that ship the SDK. Orca's CGAL-based repair (MeshBoolean::cgal::repair) works
+    // on all three platforms, so use that instead.
     settings.mesh_repair_callback = [](const indexed_triangle_set& mesh,
                                        indexed_triangle_set&       repaired_mesh,
                                        std::function<void(const char*, unsigned)> progress_callback,

src/slic3r/GUI/Widgets/DropDown.cpp

@@ -360,8 +360,7 @@ void DropDown::render(wxDC &dc)
     for (int i = 0; i < items.size(); ++i) {
         auto &item = items[i];
         int states2 = states;
-        // Dimmed items stay selectable but render greyed out (used by the mixed-filament
-        // dialog to show components that are already consumed by another mix).
+        // Dimmed items render greyed out but stay selectable, so they cannot reuse the disabled state.
         bool is_dimmed = (item.style & DD_ITEM_STYLE_DIMMED) != 0;
         if ((item.style & DD_ITEM_STYLE_DISABLED) != 0)
             states2 &= ~StateColor::Enabled;

src/slic3r/GUI/WipeTowerDialog.cpp

@@ -261,10 +261,9 @@ static std::vector<float> MatrixFlatten(const WipingDialog::VolumeMatrix& matrix
     return vec;
 }
 
-// Mixed-color slots are virtual: they are never loaded into a tray and so have no flushing
-// volumes of their own. The dialog therefore shows only the physical filaments, which means
-// converting between the full config matrix (indexed by config slot) and a dense physical
-// sub-matrix (indexed by row/column in the table).
+// Mixed-color slots are virtual and have no flushing volumes, so the dialog shows only the
+// physical filaments. That means converting between the full config matrix (indexed by config
+// slot) and a dense physical sub-matrix (indexed by row/column in the table).
 static std::vector<double> extract_physical_sub_matrix(
     const std::vector<double>& full_matrix, size_t full_n,
     const std::vector<size_t>& indices)