Bugfix: changes in extruder count in GUI were not propagating to the rest of the GUI

lib/Slic3r/GUI/MainFrame.pm

@@ -85,8 +85,13 @@ sub _init_tabpanel {
         my $tab;
         $tab = $self->{options_tabs}{$tab_name} = ($class_prefix . ucfirst $tab_name)->new($panel);
         $tab->on_value_change(sub {
+            my ($opt_key, $value) = @_;
+            
             my $config = $tab->config;
-            $self->{plater}->on_config_change($config) if $self->{plater}; # propagate config change events to the plater
+            if ($self->{plater}) {
+                $self->{plater}->on_config_change($config); # propagate config change events to the plater
+                $self->{plater}->on_extruders_change($value) if $opt_key eq 'extruders_count';
+            }
             if ($self->{loaded}) {  # don't save while loading for the first time
                 if ($self->{mode} eq 'simple') {
                     # save config

lib/Slic3r/GUI/Tab.pm

@@ -405,6 +405,17 @@ sub get_field {
     return undef;
 }
 
+sub set_value {
+    my $self = shift;
+    my ($opt_key, $value) = @_;
+    
+    my $changed = 0;
+    foreach my $page (@{ $self->{pages} }) {
+        $changed = 1 if $page->set_value($opt_key, $value);
+    }
+    return $changed;
+}
+
 package Slic3r::GUI::Tab::Print;
 use base 'Slic3r::GUI::Tab';
 
@@ -948,9 +959,7 @@ sub build {
             $optgroup->on_change(sub {
                 my ($opt_id) = @_;
                 if ($opt_id eq 'extruders_count') {
-                    $self->{extruders_count} = $optgroup->get_value('extruders_count');
-                    $self->_build_extruder_pages;
-                    $self->_update;
+                    $self->_extruders_count_changed($optgroup->get_value('extruders_count'));
                 }
             });
         }
@@ -1004,6 +1013,16 @@ sub build {
     $self->_build_extruder_pages;
 }
 
+sub _extruders_count_changed {
+    my ($self, $extruders_count) = @_;
+    
+    $self->{extruders_count} = $extruders_count;
+    $self->_build_extruder_pages;
+    $self->_update;
+    $self->set_dirty(1);
+    $self->_on_value_change('extruders_count', $extruders_count);
+}
+
 sub _extruder_options { qw(nozzle_diameter extruder_offset retract_length retract_lift retract_speed retract_restart_extra retract_before_travel wipe
     retract_layer_change retract_length_toolchange retract_restart_extra_toolchange) }
 
@@ -1110,14 +1129,13 @@ sub _update {
 # this gets executed after preset is loaded and before GUI fields are updated
 sub on_preset_loaded {
     my $self = shift;
-    return;
+    
     # update the extruders count field
     {
         # update the GUI field according to the number of nozzle diameters supplied
-        $self->set_value('extruders_count', scalar @{ $self->{config}->nozzle_diameter });
-        
-        # update extruder page list
-        $self->_on_value_change('extruders_count');
+        my $extruders_count = scalar @{ $self->{config}->nozzle_diameter };
+        $self->set_value('extruders_count', $extruders_count);
+        $self->_extruders_count_changed($extruders_count);
     }
 }