SuperDevMode does not see sources from another project (Eclipse)

Suppose I have one library (configured in Eclipse as standalone project - LibProj) and one application (configured in Eclipse as separate project - AppProj) that uses that library.

During regular application development, I include library's .jar with classes and sources and that works flawlessly.

However, while maintaining a library (e.g. adding feature that application uses), I find it useful to add LibProj on AppProj's build path and then hack on both sources without rebuilding library's jar every time. This works for regular Java code, but when I try to invoke SuperDevMode for a module that uses some stuff from library, SDM complains that it can not find sources for used classes. In Eclipse I have no problems compiling AppProj - it sees classes from LibProj, so problem is obviously in sources for that classes.

What I did:

* placed LibProj on AppProj's build path (AppProj -> Properties -> Java Build Path -> Projects)

* made sure that debug configuration that launches SDM has LibProj on classpath (tab Classpath in debug configuration settings)

* made sure that debug configuration that launches SDM has LibProj sources available (tab Sources in debug configuration settings)

What am I missing?

Eclipse Mars.1 (4.5.1)

Java 7

GWT 2.7

Google Plugin for Eclipse 4.4 (0.0.0.201512080655)

If it makes any difference both LibProj and AppProj are Gradle projects (I use Buildship 1.0.6.v20151126-1638 for Eclipse-Gradle integration).

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