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To flush the refactoring undo listener we are listening to Java model deltas. In the past we got a delta for the original CU when a working copy got saved. This isn't the case anymore which primary working copies since the structure didn't change. But to flush the undo stack we somehow need an indication that a CU got saved. For M4 we can flush the undo listener whenever the working copy changes, which flushes to often but at least flushes ;-).
Martin said you didn't need it. What do you want?
I discussed it with Martin and the problem is triggered by the fact that we don't get a changed delta when the user types into a compilation unit without causing structural changes. I will change the title to reflect this. A delta on save isn't needed.
*** This bug has been marked as a duplicate of 32639 ***
