add force depsgraph update method

src/blenderbim/blenderbim/tool/blender.py

@@ -248,6 +248,15 @@ class Blender:
     def update_viewport(cls):
         tool.Blender.get_viewport_context()["area"].tag_redraw()
 
+    @classmethod
+    def force_depsgraph_update(cls):
+        """useful if you need to trigger callbacks like `depsgraph_update_pre`"""
+        # blender is requiring some ID to be changed
+        # to trigger depsgraph update
+        scene = bpy.context.scene
+        scene.show_subframe = scene.show_subframe
+        bpy.context.view_layer.update()
+
     @classmethod
     def ensure_unique_name(cls, name, objects, iteration=0):
         """returns a unique name for the given name and dictionary of objects

src/blenderbim/test/tool/test_drawing.py

@@ -681,9 +681,6 @@ class TestDrawingMaintainingSheetPosition(NewFile):
         obj = bpy.data.objects["Cube"]
         bpy.ops.bim.assign_class(ifc_class="IfcActuator", predefined_type="ELECTRICACTUATOR", userdefined_type="")
 
-        def update_depsgraph():
-            obj.hide_render = obj.hide_render  # hacky way to trigger depsgraph_update_pre
-
         bpy.ops.bim.load_sheets()
         bpy.ops.bim.add_sheet()
 
@@ -714,7 +711,7 @@ class TestDrawingMaintainingSheetPosition(NewFile):
 
         bpy.context.scene.camera.data.BIMCameraProperties.width = 25
         bpy.context.scene.camera.data.BIMCameraProperties.height = 25
-        update_depsgraph()
+        tool.Blender.force_depsgraph_update()
 
         bpy.ops.bim.create_drawing()
         bpy.ops.bim.open_sheet()