I'm pretty sure Andreas wrote that comment.  I don't know what
MethodDictionary "compaction" is, but maybe it is not called from
elsewhere than its cleanUp method..??

On Wed, Sep 4, 2013 at 8:26 AM, Levente Uzonyi <leves at elte.hu> wrote:
> On Sat, 31 Aug 2013, commits at source.squeak.org wrote:
>
>> Chris Muller uploaded a new version of System to project The Trunk:
>> http://source.squeak.org/trunk/System-cmm.586.mcz
>>
>> ==================== Summary ====================
>>
>> Name: System-cmm.586
>> Author: cmm
>> Time: 31 August 2013, 3:29:01.755 pm
>> UUID: bbffd13c-e516-462d-ac89-e3880a28c382
>> Ancestors: System-fbs.585
>>
>> - Remove modal confirmation pop-up buried in system code.  If this is
>> necessary it should be invoked from calling code.
>> - Factor SmalltalkImage>>#unloadAllKnownPackages into several smaller
>> methods to allow more deliberate shrinking.
>> - Remove method referring to undefined "ScrapsBook".
>>
>> =============== Diff against System-fbs.585 ===============
>>
>> Item was changed:
>>  ----- Method: SmalltalkImage>>cleanUp:except: (in category
>> 'housekeeping') -----
>> + cleanUp: aggressive except: exclusions
>> - cleanUp: aggressive except: exclusions
>>         "Clean up. When aggressive is true, this will destroy projects,
>> change sets, etc.
>>         Leave out any classes specifically listed in exclusions."
>> -
>>         "Smalltalk cleanUp: true except: {Project. ChangeSet}"
>> +       "Find all classes implementing #cleanUp or cleanUp:"
>> +       | classes |
>> +       classes := Smalltalk allClasses select:
>> +               [ : eachClass | (eachClass class includesSelector:
>> #cleanUp) or:
>> +                       [ (eachClass class includesSelector: #cleanUp:)
>> and: [ (exclusions includes: eachClass) not ] ] ].
>> +       "Arrange classes in superclass order, superclasses before
>> subclasses, so that specific cleanup (like MethodDictionary compaction) will
>> run after generic superclass cleanup (HashedCollection rehashing). Otherwise
>> generic superclass cleanup might undo specific one (in this case rehashing
>> will undo a good bit of MD compaction)."
>
>
> I don't really get this comment. MethodDictionary has no specific cleanUp
> method, because the one in HashedCollection handles all sub-instances.
>
>
> Levente
>