Merge pull request #7386 from Duhemm/log4j-loggers-list

Keep logger names in hash set

build.sbt

@@ -428,6 +428,7 @@ lazy val utilLogging = (project in file("internal") / "util-logging")
       exclude[MissingTypesProblem]("sbt.internal.util.ConsoleAppender"),
       exclude[MissingTypesProblem]("sbt.internal.util.BufferedAppender"),
       exclude[MissingClassProblem]("sbt.internal.util.Terminal$BlockingInputStream$"),
+      exclude[IncompatibleResultTypeProblem]("sbt.util.LoggerContext#Log4JLoggerContext.loggers"),
     ),
   )
   .configure(addSbtIO)

internal/util-logging/src/main/scala/sbt/util/LoggerContext.scala

@@ -46,7 +46,7 @@ object LoggerContext {
       case a: AbstractConfiguration => a
       case _                        => throw new IllegalStateException("")
     }
-    val loggers = new java.util.Vector[String]
+    val loggers = new java.util.HashSet[String]
     private[this] val closed = new AtomicBoolean(false)
     override def logger(
         name: String,