Allow reverse on odd without detect overhang wall (#6922)

Fixes #6920

src/libslic3r/PerimeterGenerator.cpp

@@ -735,6 +735,12 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
  if(paths.empty()) continue;
  chain_and_reorder_extrusion_paths(paths, &paths.front().first_point());
  } else {
+ if (overhangs_reverse && perimeter_generator.layer_id > perimeter_generator.object_config->raft_layers) {
+ // Always reverse if detect overhang wall is not enabled
+ steep_overhang_contour = true;
+ steep_overhang_hole = true;
+ }
+
  ExtrusionPath path(role);
  //BBS.
  path.polyline = polygon.split_at_first_point();
@@ -1219,6 +1225,12 @@ static ExtrusionEntityCollection traverse_extrusions(const PerimeterGenerator& p
  }
  }
  else {
+ if (overhangs_reverse && perimeter_generator.layer_id > perimeter_generator.object_config->raft_layers) {
+ // Always reverse if detect overhang wall is not enabled
+ steep_overhang_contour = true;
+ steep_overhang_hole = true;
+ }
+
  extrusion_paths_append(paths, *extrusion, role, is_external ? perimeter_generator.ext_perimeter_flow : perimeter_generator.perimeter_flow);
  }
 

src/libslic3r/PrintConfig.cpp

@@ -1056,7 +1056,8 @@ void PrintConfigDef::init_fff_params()
  def->category = L("Quality");
  // xgettext:no-c-format, no-boost-format
  def->tooltip = L("Number of mm the overhang need to be for the reversal to be considered useful. Can be a % of the perimeter width."
- "\nValue 0 enables reversal on every even layers regardless.");
+ "\nValue 0 enables reversal on every even layers regardless."
+ "\nWhen Detect overhang wall is not enabled, this option is ignored and reversal happens on every even layers regardless.");
  def->sidetext = L("mm or %");
  def->ratio_over = "line_width";
  def->min = 0;

src/slic3r/GUI/ConfigManipulation.cpp

@@ -736,8 +736,9 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig *config, co
  bool has_detect_overhang_wall = config->opt_bool("detect_overhang_wall");
  bool has_overhang_reverse = config->opt_bool("overhang_reverse");
  bool force_wall_direction = config->opt_enum<WallDirection>("wall_direction") != WallDirection::Auto;
- bool allow_overhang_reverse = has_detect_overhang_wall && !has_spiral_vase && !force_wall_direction;
+ bool allow_overhang_reverse = !has_spiral_vase && !force_wall_direction;
  toggle_field("overhang_reverse", allow_overhang_reverse);
+ toggle_field("overhang_reverse_threshold", has_detect_overhang_wall);
  toggle_line("overhang_reverse_threshold", allow_overhang_reverse && has_overhang_reverse);
  toggle_line("overhang_reverse_internal_only", allow_overhang_reverse && has_overhang_reverse);
  bool has_overhang_reverse_internal_only = config->opt_bool("overhang_reverse_internal_only");