Possible API enhancement: deprecate GPR.sR and
GPR.findResource; introduce into GPR

public ClassPath getRelevantSources();
public ClassPath getRelevantJavadoc();

where gRS would work similarly to the current sR -
i.e. start with all CP.SOURCE, and add all SFBQ
translations of CP.COMPILE and CP.BOOT; and gRJ
would list all JFBQ translations of COMPILE and
BOOT, thus being ready to use for e.g. View ->
Documentation Indices.

Since the return value is a ClassPath, you would
not need a separate change firing API; you can
listen to CP.roots as usual.

Also GPR.fR would be unnecessary since you could
use the CP methods to do this.