Relocate extensionClasses and staticExtensionClasses

Author: Goooler

src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/transformers/GroovyExtensionModuleTransformer.kt

@@ -2,6 +2,7 @@ package com.github.jengelman.gradle.plugins.shadow.transformers
 
 import com.github.jengelman.gradle.plugins.shadow.internal.inputStream
 import com.github.jengelman.gradle.plugins.shadow.internal.zipEntry
+import com.github.jengelman.gradle.plugins.shadow.relocation.relocateClass
 import java.util.Properties
 import org.apache.tools.zip.ZipOutputStream
 import org.gradle.api.file.FileTreeElement
@@ -46,8 +47,19 @@ public open class GroovyExtensionModuleTransformer : ResourceTransformer {
         }
         KEY_EXTENSION_CLASSES,
         KEY_STATIC_EXTENSION_CLASSES,
-        -> handle(key, value as String) { existingValue ->
-          module.setProperty(key, "$existingValue,$value")
+        -> {
+          val relocatedValue = (value as String).split(',').joinToString(",") { className ->
+            var relocatedClass = className
+            context.relocators.forEach { relocator ->
+              if (relocator.canRelocateClass(relocatedClass)) {
+                relocatedClass = relocator.relocateClass(relocatedClass)
+              }
+            }
+            relocatedClass
+          }
+          handle(key, relocatedValue) { existingValue ->
+            module.setProperty(key, "$existingValue,$relocatedValue")
+          }
         }
       }
     }