IssueTracker

Proguard 6 added the includecode keep option modifiers:

includecode
Specifies that code attributes of the methods that the fields that the -keep option keeps should be kept as well, i.e. may not be optimized or obfuscated. This is typically useful for already optimized or obfuscated classes, to make sure that their code is not modified during optimization.

The words "that the fields" in the first sentence should probably be removed for it to make sense.