Cannot set breakpoints in source code of dependencies after navigating to them using jump-to-definition

[ahoppen]

The index build and the real build maintain two separate checkouts of the package dependencies. Because of this, jump-to-definition takes you to the source file in the .build/index-build folder, while the build uses the checkout in the .build. Hence, setting a breakpoint in the index-build checkout does not cause the breakpoint to be hit at runtime.

[ahoppen]

Synced to Apple’s issue tracker as rdar://141016927