fixup! Add SeqSet and SetFromMap implementations

tweak SeqSet inheritance order

Author: NthPortal

src/main/scala/scala/collection/SetFromMap.scala

@@ -46,9 +46,9 @@ private object SetFromMap extends SetFromMapMetaFactory[Map, Set] {
 @SerialVersionUID(3L)
 private class SeqSetFromMap[A](protected[collection] val underlying: SeqMap[A, Unit])
     extends AbstractSet[A]
-    with SeqSet[A]
     with SetFromMapOps.Unknown[A, SeqMap, SeqMap[A, Unit], SeqSetFromMap, SeqSetFromMap[A]]
     with SetFromMapOps.Unsorted[A, SeqMap, SeqSetFromMap]
+    with SeqSet[A]
     with IterableFactoryDefaults[A, SeqSetFromMap]
     with DefaultSerializable {
   protected[this] def fromMap[B](m: SeqMap[B, Unit]): SeqSetFromMap[B] = new SeqSetFromMap(m)

src/main/scala/scala/collection/concurrent/SetFromMap.scala

@@ -27,8 +27,6 @@ private class SetFromMap[A](override protected[collection] val underlying: Map[A
   override protected[this] def fromMap[B](m: mutable.Map[B, Unit]): mutable.SetFromMap[B] =
     SetFromMap.fromMutableMap(m)
 
-  override protected[this] def className: String = "SetFromMap"
-
   override def iterableFactory: IterableFactory[m.SetFromMap] =
     new SetFromMap.MutableFactory(underlying.mapFactory)
 }

src/main/scala/scala/collection/immutable/SetFromMap.scala

@@ -72,8 +72,8 @@ private object SetFromMap extends SetFromMapMetaFactory[Map, Set] {
 @SerialVersionUID(3L)
 private class SeqSetFromMap[A](protected[collection] val underlying: SeqMap[A, Unit])
     extends AbstractSet[A]
-    with SeqSet[A]
     with SetFromMapOps.Unsorted[A, SeqMap, SeqSetFromMap]
+    with SeqSet[A]
     with IterableFactoryDefaults[A, SeqSetFromMap]
     with DefaultSerializable {
   protected[this] def fromMap[B](m: SeqMap[B, Unit]): SeqSetFromMap[B] =

src/main/scala/scala/collection/mutable/SetFromMap.scala

@@ -78,9 +78,9 @@ private[collection] object SetFromMap extends SetFromMapMetaFactory[Map, Set] {
 @SerialVersionUID(3L)
 private class SeqSetFromMap[A](protected[collection] val underlying: SeqMap[A, Unit])
     extends AbstractSet[A]
-    with SeqSet[A]
     with SetFromMapOps[A, SeqMap, SeqMap[A, Unit], SeqSetFromMap, SeqSetFromMap[A]]
     with SetFromMapOps.Unsorted[A, SeqMap, SeqSetFromMap]
+    with SeqSet[A]
     with IterableFactoryDefaults[A, SeqSetFromMap]
     with DefaultSerializable {
   protected[this] def fromMap[B](m: SeqMap[B, Unit]): SeqSetFromMap[B] = new SeqSetFromMap(m)