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Today, if several editors (diagrams) from the same session are opened, then an action in one editor (diagram) will make it dirty if it changes the corresponding semantic model or if it changes the diagram itself. Furthermore, all others opened editors will become dirty too. I understand the technical reasons for such a behavior (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=497080) From a strictly user point of view, I think only the opened editors that have been modified by the user action should become dirty. If the user action only change the semantic model, then may be the semantic model should become dirty in the model explorer. An alternative solution would be to only set the dirty state to the project that contains the semantic model and the aird file that contains the diagrams, not to the editors. That are just ideas, I don't pretend this is the way the tool should evolve.
Thanks for your detailed enhancement submit. We agree that it would be an interesting improvement. Nevertheless, the specification may be difficult to define and the change will be very impacting. We have currently not planned to work on it in the following releases.
For the record, Bug 493367 and Bug 494766 are going into this direction by offering the possibility to decouple the representations from the ResourceSet which might then get their own dirty state lifecycle.
