add operator to quickly attach a sun to the sky

engine/final.py

@@ -103,7 +103,7 @@ def _render_layer(engine, scene):
     last_stat_refresh = time()
     computed_optimal_clamp = False
 
-    while not engine.test_break() and not done:
+    while not done:
         now = time()
 
         if now - last_stat_refresh > stat_refresh_interval:

operators/__init__.py

@@ -140,3 +140,17 @@ def execute(self, context):
             new_node.node_tree = vol_tree
 
         return {"FINISHED"}
+
+
+class LUXCORE_OT_attach_sun_to_sky(bpy.types.Operator):
+    bl_idname = "luxcore.attach_sun_to_sky"
+    bl_label = "Attach to Sky"
+    bl_description = "Attach if the sky should use the rotation and turbidity settings of this sun"
+
+    @classmethod
+    def poll(cls, context):
+        return context.scene.world and context.object
+
+    def execute(self, context):
+        context.scene.world.luxcore.sun = context.object
+        return {"FINISHED"}

ui/light.py

@@ -85,6 +85,9 @@ def draw(self, context):
             layout.prop(lamp.luxcore, "sun_type", expand=True)
 
             if lamp.luxcore.sun_type == "sun":
+                world = context.scene.world
+                if world.luxcore.light == "sky2" and world.luxcore.sun != context.object:
+                    layout.operator("luxcore.attach_sun_to_sky", icon="WORLD")
                 layout.prop(lamp.luxcore, "relsize")
                 layout.prop(lamp.luxcore, "turbidity")
             elif lamp.luxcore.sun_type == "distant":