Soft-implemented methods are not 'unmapped' properly

[Aaron1011]

When mixin.env.remapRefMap is enabled (such as when using GradleStart), Mixin allows running an obfuscated Mixin-using jar (e.g. a production SpongeForge jar) in a development environment. However, Mixin currently fails to properly deobfuscate any 'soft-implemented' methods.

In InterfaceInfo#renameMethod, Mixin checks to ensure that the soft-implemented prefixed method is present in the target interface. When running an obfuscated jar in a development environment, this.methods will contain deobfuscated method names, since the target interface will have been run through DeobfuscatedTransformer. However, the prefixed method in the Mixin class will still be obfuscated, since a prefixed method won't match any SRGs when the Mixin class bytes are loaded.

[Mumfrey]

Ah ok. Will look into that.