filter diff with IFCSelector

src/blenderbim/blenderbim/bim/module/diff/operator.py

@@ -115,6 +115,7 @@ class ExecuteIfcDiff(bpy.types.Operator):
             context.scene.DiffProperties.diff_new_file,
             self.filepath,
             context.scene.DiffProperties.diff_relationships.split(),
+            context.scene.DiffProperties.diff_filter_elements,
         )
         ifc_diff.diff()
         ifc_diff.export()

src/blenderbim/blenderbim/bim/module/diff/prop.py

@@ -36,3 +36,4 @@ class DiffProperties(PropertyGroup):
     diff_old_file: StringProperty(default="", name="Diff Old IFC File")
     diff_new_file: StringProperty(default="", name="Diff New IFC File")
     diff_relationships: StringProperty(default="", name="Diff Relationships")
+    diff_filter_elements: StringProperty(default="", name="Diff Filter")

src/blenderbim/blenderbim/bim/module/diff/ui.py

@@ -49,6 +49,9 @@ class BIM_PT_diff(Panel):
         row = layout.row(align=True)
         row.prop(bim_properties, "diff_relationships")
         
+        row = layout.row(align=True)
+        row.prop(bim_properties, "diff_filter_elements")
+
         row = layout.row()
         row.operator("bim.execute_ifc_diff")