I'm not entirely sure I fully understand the scenario, but it sounds about right. Except that as far as I've understood no one has committed to actually coding something like this. (And I definitely do not have the time to do this until about December or something.)
Ivan Louette wrote:
Now to be more precise again : admitting I work with the future corrected version of Inkscape, I select an object or a picture in my document, I click on a filter in one of the lists in a Filters submenu while the filters.svg file in Inkscape directory is the same than today. Will Inkscape new version add to the filter the instructions needed to display the filter like it displays in Inkscape today ?
Sorry, I am a visual person and not a coder (if I could I would... but at the moment no time to go further in this direction I am afraid) and I try to understand the most clearly I can because I must evaluate which kind and amount of work will be needed to adapt the results of my work if necessary.