Add a test to check for keeping a selected url upon reload.

main/Load.scala

@@ -611,7 +611,7 @@ object Load
 	{
 		val rootProject: URI => String = Load getRootProject units
 		def allProjects: Seq[ResolvedProject] = units.values.flatMap(_.defined.values).toSeq
-		def allProjects(build: URI): Seq[ResolvedProject] = units(build).defined.values.toSeq
+		def allProjects(build: URI): Seq[ResolvedProject] = units.get(build) map(_.defined.values.toSeq) getOrElse Seq.empty
 		def allProjectRefs: Seq[ProjectRef] = units.toSeq flatMap { case (build, unit) => refs(build, unit.defined.values.toSeq) }
 		def allProjectRefs(build: URI): Seq[ProjectRef] = refs(build, allProjects(build))
 		val extra: BuildUtil[ResolvedProject] = buildUtil(root, units, index.keyIndex, data)

sbt/src/sbt-test/actions/reload/changes/Build1.scala

@@ -1,8 +0,0 @@
-import sbt._
-
-object Build1 extends Build
-{
-	lazy val root1 = Project("root1", file("root1")) settings(
-		TaskKey[Unit]("g") := {}
-	)
-}

sbt/src/sbt-test/actions/reload/changes/Build2.scala

@@ -1,6 +0,0 @@
-import sbt._
-
-object Build2 extends Build
-{
-	lazy val root2 = Project("root2", file("root2"))
-}

sbt/src/sbt-test/actions/reload/changes/Changed.scala

@@ -0,0 +1,7 @@
+import sbt._
+
+object TestBuild extends Build
+{
+	lazy val root1 = Project("root1", file(".")) dependsOn(root2)
+	lazy val root2 = ProjectRef(uri("external"), "root2")
+}

sbt/src/sbt-test/actions/reload/external/project/Ext.scala

@@ -0,0 +1,8 @@
+import sbt._
+
+object Ext extends Build
+{
+	lazy val root2 = Project("root2", file("root2")) settings(
+		TaskKey[Unit]("g") := {}
+	)
+}

sbt/src/sbt-test/actions/reload/test

@@ -3,11 +3,11 @@
 > f
 > reload
 > f
-$ copy-file changes/Build1.scala project/TestProject.scala
+$ copy-file changes/Changed.scala project/TestProject.scala
 > reload
 -> f
+> project {external}root2
 > g
 # The current URI should be kept
-$ copy-file changes/Build2.scala project/First.scala
 > reload
 > g