Merge upstream/main into belt/rebase/may-18

Reconciles the belt-printer branch with upstream PRs through #13723. Six
files had conflicts; three additional files needed manual follow-up fixes
where the auto-merge produced code that referenced upstream-renamed fields
or changed function signatures.

Notable reconciliations:
- TreeSupport.cpp: kept belt-floor early-exit branches around HEAD's
  drop-down logic, folded upstream's `(distance_to_top > 0 ? 1 : 0)`
  formula into the non-belt-floor path (upstream PR #11812). Dropped dead
  `roof_enabled`/`force_tip_to_roof` locals.
- TreeSupport3D.cpp: combined upstream's safety-offset + remove_small
  changes with HEAD's belt-floor clip in the per-slice trim loop. Dropped
  HEAD's `else` block (superseded by upstream's rewritten bottom-contact
  propagation) and re-added the belt-floor clip into the new propagation
  loop. Gated the propagation on belt printers to prevent OOM when
  belt-floor clipping produces empty initial slices.
- TriangleSelector.{cpp,hpp}: merged both new `select_patch` parameters
  (HEAD's `up_direction` and upstream's `select_partially`); body uses
  `dot(up_direction)` for the overhang angle check and forwards
  `select_partially` to `select_triangle`.
- SupportMaterial.cpp: `slicing_params.soluble_interface` →
  `zero_gap_interface_bottom` in HEAD's `detect_belt_floor_bottom_contacts`,
  matching upstream's same-purpose rename at line 2495.
- Custom.json, GCodeWriter.cpp: simple additive merges (kept entries /
  includes from both sides).

Verified by building OrcaSlicer (RelWithDebInfo) after a full deps
rebuild (Eigen v5.0.1, libigl v2.6.0 are now managed deps) and slicing
a scaled Benchy on the NORMALIZER belt-printer profile without OOM.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/libslic3r/GCode.cpp

@@ -1164,10 +1164,15 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
         const bool is_ramming       = (gcodegen.config().single_extruder_multi_material) ||
                                 (!gcodegen.config().single_extruder_multi_material &&
                                  gcodegen.config().filament_multitool_ramming.get_at(tcr.initial_tool));
+        // Orca: user-facing override (Printer Settings > Wipe tower > "Tool change on wipe tower").
+        // Forces the toolhead to travel over the wipe tower before issuing Tx even on multi-toolhead
+        // printers without ramming, where Orca would otherwise emit Tx in place (potentially over the part).
+        const bool tool_change_on_wipe_tower = gcodegen.config().tool_change_on_wipe_tower.value;
         const bool should_travel_to_tower = !tcr.priming && (tcr.force_travel     // wipe tower says so
                                                              || !needs_toolchange // this is just finishing the tower with no toolchange
                                                              || will_go_down // Make sure to move to prime tower before moving down
-                                                             || is_ramming);
+                                                             || is_ramming
+                                                             || tool_change_on_wipe_tower);
 
         if (should_travel_to_tower || gcodegen.m_need_change_layer_lift_z) {
             // FIXME: It would be better if the wipe tower set the force_travel flag for all toolchanges,
@@ -3966,6 +3971,17 @@ void GCode::print_machine_envelope(GCodeOutputStream &file, Print &print)
 
         // New Marlin uses M205 J[mm] for junction deviation (only apply if it is > 0)
         file.write_format(writer().set_junction_deviation(config().machine_max_junction_deviation.values.front()).c_str());
+
+        // Orca: Override input shaping values
+        if (print.config().input_shaping_emit.value && flavor != gcfMarlinLegacy) {
+            const bool input_shaping_disable = print.config().input_shaping_type.value == InputShaperType::Disable;
+            file.write_format(writer().set_input_shaping('X', print.config().input_shaping_damp_x.value,
+                print.config().input_shaping_freq_x.value, print.config().opt_serialize("input_shaping_type")).c_str());
+            if (flavor != gcfRepRapFirmware && !input_shaping_disable) {
+                file.write_format(writer().set_input_shaping('Y', print.config().input_shaping_damp_y.value,
+                    print.config().input_shaping_freq_y.value, "").c_str());
+            }
+        }
     }
 }