fixes #73

build.sbt

@@ -4,7 +4,7 @@ scalaModuleSettings
 
 name               := "scala-swing"
 
-version            := "2.0.2-SNAPSHOT"
+version            := "2.0.3-SNAPSHOT"
 
 scalacOptions      ++= Seq("-deprecation", "-feature")
 
@@ -20,7 +20,13 @@ mimaPreviousVersion := Some("2.0.0")
 // set the prompt (for this build) to include the project id.
 shellPrompt in ThisBuild := { state => Project.extract(state).currentRef.project + "> " }
 
-lazy val swing = project.in( file(".") )
+lazy val swing = project.in(file("."))
+  .settings(
+    libraryDependencies += {
+      val v = if (scalaVersion.value == "2.13.0-M3") "3.0.5-M1" else "3.0.5"
+      "org.scalatest" %% "scalatest" % v % "test"
+    }
+  )
 
 lazy val examples = project.in( file("examples") )
   .dependsOn(swing)

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.17
+sbt.version=0.13.17

project/plugins.sbt

@@ -1 +1 @@
-addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "1.0.13")
+addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "1.0.14")

src/main/scala/scala/swing/RichWindow.scala

@@ -121,7 +121,7 @@ object Dialog {
   object Result extends Enumeration {
     import JOptionPane._
     val Yes   : Result.Value = Value(YES_OPTION)
-    val Ok    : Result.Value = Value(OK_OPTION)
+    val Ok    : Result.Value = Yes  // N.B. Do not use `Value` because id 0 is already used
     val No    : Result.Value = Value(NO_OPTION)
     val Cancel: Result.Value = Value(CANCEL_OPTION)
     val Closed: Result.Value = Value(CLOSED_OPTION)

src/test/scala/scala/swing/Issue73.scala

@@ -0,0 +1,30 @@
+package scala.swing
+
+import org.scalatest.{FlatSpec, Matchers}
+
+class Issue73 extends FlatSpec with Matchers {
+  "Enumerations" should "not contain duplicate ids" in {
+    // the initializers of any of these will through an
+    // assertion error if an enumeration `Value` id is used twice.
+    Alignment
+    BorderPanel.Position
+    Dialog.Message
+    Dialog.Options
+    Dialog.Result
+    FileChooser.Result
+    FileChooser.SelectionMode
+    FlowPanel.Alignment
+    FormattedTextField.FocusLostBehavior
+    GridBagPanel.Anchor
+    GridBagPanel.Fill
+    ListView.IntervalMode
+    Orientation
+    ScrollPane.BarPolicy
+    TabbedPane.Layout
+    Table.AutoResizeMode
+    Table.ElementMode
+    Table.IntervalMode
+    event.Key
+    event.Key.Location
+  }
+}