https://bugs.eclipse.org/bugs/show_bug.cgi?id=115425
This fix plugs a major hole in our ability to facilitate
extenders in declaring version change logic for facets. Currently, if you
supply a version change delegate for version X, that delegate has to be able to
handle any starting version. That works for some facets (such as jst.java), but
in the majority of situations, version change logic is complicated and might
only be implemented for certain specific transitions. The fix for this bug
allows such constrained version change delegates to be declared.
Patch is attached to the bug. The fix is somewhat involved and
so I would classify it as moderate risk. However, I have performed fairly
extensive tests and I am pretty confident that this will not destabilize anything.
- Konstantin
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