cab ghci can't choose sandboxed packages correctly

[konn]

If the different versions of dependent package are installed both globally and in sandbox and global version is newer than sandboxed one, then cab ghci loads global one instead of sandbox.

For example, we are writing some package foo and it depends of bar ==0.2.* and following:

$ ghc-pkg list bar
~/.ghc/x86_64-darwin-7.8.3/package.conf.d
  bar-0.2.3.1

$ cabal sandbox hc-pkg list bar
~/haskell/projects/foo/.cabal-sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d
   bar-0.2.1.4

Then, cab ghci loads global bar-0.2.3.1 rather than sandboxed bar-0.2.1.4 and leads to type-error.

cabal repl correctly loads sandboxed version in the same situation, so I think this is not intended behaviour.