Perhaps, I have to explain why fix/test cycle is so long. I'm working on mobile platform development. It is not so modular, so I need to build the whole image, then flash the mobile and test it in a real network. This takes much time and need much disk space (about 2GB of source files. In fact, significant number of these files are not needed for the build, but it is too hard to force CM engineers to fix this :-) )
In that case I think using multiple working trees, but sharing the pack files is a good idea.
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