I want to be able to track if history changed by waiting for its last element to change from modal operator. Is there a way to access such list over python?
Unfortunately, you cannot access the history list directly from python (I'm pretty confident this is the case.).
The history list is called by
bpy.ops.ed.undo_history() and doesn't have any accessible attributes that you can read into a list. In fact,
bpy.ops.ed's methods come from
bpy.types where the class starts with
bpy.ops.ed.undo() is really an instance of
It looks like the undo stuff is in the guts of blender-app.exe but you can try and mess around with this bpy.ops.ed stuff and see if you can manage something that I may be overlooking.