Module exclude problem in #1168

I have 2 modules in my project.
The 2 modules share the same content root - D:\myproject\javasrc.
There are 2 dirs in the content root - D:\myproject\javasrc\a and D:\myproject\javasrc\b.
My module A include D:\myproject\javasrc\a as its source dir and exclude D:\myproject\javasrc\b. Module B is on the contrary.
After I setted up my project, I found both a and b dir are excluded in BOTH modules.

I think the excluded dirs should apply to the module, not the project. Am I right?