After getting some more gray hairs out of this ;-) I finally found  
the problem, and eventually a solution.

Attached are 4 very small MC packages that will demonstrate the bug:

TestA-bf.1 contains class TestA
TestB-bf.1 contains class TestB
TestB-bf.1 depends on TestA-bf.1

To test, just load TestB-bf.1, which in turn loads TestA-bf.1, all is  
fine.

Now I moved the classes between the packages:

TestA-bf.2 contains class TestB
TestB-bf.2 contains class TestA
TestB-bf.2 depends on TestA-bf.2

If you now load TestB-bf.2, which in turn loads TestA-bf.2, POOF,  
both classes TestA and TestB are gone!

I believe this is also the cause for disappearing methods that are  
moved between packages.

The problem appears to be MCPackageLoader, which does not check the  
list of removals against the list of additions.

I fixed that (hopefully) in Monticello-bf.279 (http:// 
source.impara.de/mc.html). If there are more than one versions loaded  
at once, then an additional step is taken to detect and delete those  
removals that are also added. Would be nice if someone could comment  
if there is a better way to do this, but I believe it's not too bad.  
You only pay the price if indeed there is more than one version to be  
loaded.

I actually discovered this bug (though we had occasional reports  
about lost methods) when making MCConfigurations use a simultaneous  
load strategy (see MonticelloConfigurations-bf.38). With this fix,  
configs now should be able to deal with methods or classes moved from  
one package to the next, and be pretty independent of order problems.  
Perhaps using this could also help the 3.9 team switching to a more  
efficient work flow, even without the flaws I outlined last year  
(http://lists.squeakfoundation.org/pipermail/squeak-dev/2005-October/ 
096445.html).

- Bert -

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