Fix scala-js#2144: Fix ThreadLocalRandom.nextDouble(MinValue, MaxValue).

Author: nicolasstucki

javalib/src/main/scala/java/util/concurrent/ThreadLocalRandom.scala

@@ -105,8 +105,9 @@ class ThreadLocalRandom extends Random {
   def nextDouble(least: Double, bound: Double): Double = {
     if (least >= bound)
       throw new IllegalArgumentException()
-
-    nextDouble() * (bound - least) + least
+    // Ensure that rangeSize != Double.PositiveInfinity - Issue #2144
+    val rangeSize =  Math.min(bound - least, Double.MaxValue)
+    nextDouble() * rangeSize + least
   }
 }
 

test-suite/shared/src/test/require-jdk7/org/scalajs/testsuite/javalib/util/concurrent/ThreadLocalRandomTest.scala

@@ -506,8 +506,7 @@ class ThreadLocalRandomTest {
   @Test def should_return_nextDouble_that_fits_bounds(): Unit = {
     implicit val tlr = ThreadLocalRandom.current()
 
-    // Issue #2144
-    // checkDoubleBounds(Double.MinValue, Double.MaxValue)
+    checkDoubleBounds(Double.MinValue, Double.MaxValue)
     checkDoubleBounds(Double.MinValue, 0L)
     checkDoubleBounds(Double.MaxValue, 0L)
     checkDoubleBounds(0.14303466203185822, 0.7471945354839639)