I am doing multiple renders using this template: https://blender.stackexchange.com/a/71830/66604.
Method 'pre' should be executed before every render - and it is, for example then I am setting render file path in this method. But then I am setting render.border_max_x it has no effect on this render, only for next one. Why? Can it be fixed?
Perhaps this whole template can be done much simpler using peisistent handler?