This limitation (at http://jetbrains.net/jira/browse/IDEA-3692) is very
irritating for my project. There is no reasonable workaround. (Our
workaround is to deploy all of our plugins as empty jars and plugin.xml,
and place all of our source in one of the modules.) The limitation
mostly prevents concurrent development of two or more plugins when one
depends on another. I hope those of us who develop plugins will vote for it.