Fix getting used and starting extruders with new adhesion extruder settings

Getting more involved than I thought. But it's not complex yet.

Contributes to issue CURA-8868.

cura/Settings/ExtruderManager.py

@@ -259,11 +259,20 @@ class ExtruderManager(QObject):
             if support_roof_enabled:
                 used_extruder_stack_ids.add(self.extruderIds[self.extruderValueWithDefault(str(global_stack.getProperty("support_roof_extruder_nr", "value")))])
 
-        # The platform adhesion extruder. Not used if using none.
-        if global_stack.getProperty("adhesion_type", "value") != "none" or (
-                global_stack.getProperty("prime_tower_brim_enable", "value") and
-                global_stack.getProperty("adhesion_type", "value") != 'raft'):
-            extruder_str_nr = str(global_stack.getProperty("adhesion_extruder_nr", "value"))
+        # The platform adhesion extruders.
+        used_adhesion_extruders = set()
+        adhesion_type = global_stack.getProperty("adhesion_type", "value")
+        if adhesion_type == "skirt" and (global_stack.getProperty("skirt_line_count", "value") > 0 or global_stack.getProperty("skirt_brim_minimal_length", "value") > 0):
+            used_adhesion_extruders.add("skirt_brim_extruder_nr")  # There's a skirt.
+        if (adhesion_type == "brim" or global_stack.getProperty("prime_tower_brim_enable", "value")) and (global_stack.getProperty("brim_line_count", "value") > 0 or global_stack.getProperty("skirt_brim_minimal_length", "value") > 0):
+            used_adhesion_extruders.add("skirt_brim_extruder_nr")  # There's a brim or prime tower brim.
+        if adhesion_type == "raft":
+            used_adhesion_extruders.add("raft_base_extruder_nr")
+            used_adhesion_extruders.add("raft_interface_extruder_nr")
+            if global_stack.getProperty("raft_surface_layers", "value") > 0:
+                used_adhesion_extruders.add("raft_surface_extruder_nr")
+        for extruder_setting in used_adhesion_extruders:
+            extruder_str_nr = str(global_stack.getProperty(extruder_setting, "value"))
             if extruder_str_nr == "-1":
                 extruder_str_nr = self._application.getMachineManager().defaultExtruderPosition
             if extruder_str_nr in self.extruderIds:
@@ -286,8 +295,11 @@ class ExtruderManager(QObject):
         global_stack = application.getGlobalContainerStack()
 
         # Starts with the adhesion extruder.
-        if global_stack.getProperty("adhesion_type", "value") != "none":
-            return global_stack.getProperty("adhesion_extruder_nr", "value")
+        adhesion_type = global_stack.getProperty("adhesion_type", "value")
+        if adhesion_type in {"skirt", "brim"}:
+            return global_stack.getProperty("skirt_brim_extruder_nr", "value")
+        if adhesion_type == "raft":
+            return global_stack.getProperty("raft_base_extruder_nr", "value")
 
         # No adhesion? Well maybe there is still support brim.
         if (global_stack.getProperty("support_enable", "value") or global_stack.getProperty("support_structure", "value") == "tree") and global_stack.getProperty("support_brim_enable", "value"):