[Dbix-class] Duplicate isa bug in Componentized.pm

[Matt S Trout]

phaylon wrote:
> Shevek wrote:
>> Note that now $self->{components} contains ResultSetManager twice.
>> [...]
>> So @to_inject now contains a duplicate, which isn't yet present. grep
>> passes the duplicate.
>>
>> Now Class::C3 fails on the same thing twice in one ISA array (which is
>> debatably a bug in itself). It gives an inability to resolve etc etc.
> 
> I attached a possible patch against DBIx-Class-current, includes fix and
> a Testcase.

Looks reasonable; can you rework against trunk (since this is a bugfix) and 
commit please?

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