Scenario:
dependency = dev-lang/python
SLOT intersection = enabled
available slots = 2.6, 2.7, 3.2
installed slot = 2.7
The SLOT intersection feature worked correctly but in the end
dev-lang/python was added to the unsatisfied set because there
was a dev-lang/python-2.7 update as well. This results in other
dep calculation code to match dev-lang/python against 3.2 instead.
The SLOT intersection feature has to reduce the dependency string
scope by adding a SLOT suffix (in this case: ":2.7"). This way the
correct dependency is eventually pulled in.
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