The documentation for the bpy.app.handlers.scene_update_{pre,post} handlers states that they're called "on updating the scenes data". However, they're called even when the data hasn't changed. Of course such handlers are useful, but the documentation should reflect the current behaviour. Reviewers: mont29, sergey Subscribers: Blendify Maniphest Tasks: T46329 Differential Revision: https://developer.blender.org/D1535