Tweak dependency printing

core/shared/src/main/scala/coursier/util/Print.scala

@@ -45,10 +45,10 @@ object Print {
     )
 
     val deps1 = minDeps
-      .groupBy(_.copy(configuration = ""))
+      .groupBy(_.copy(configuration = "", attributes = Attributes("", "")))
       .toVector
       .map { case (k, l) =>
-        k.copy(configuration = l.toVector.map(_.configuration).sorted.mkString(";"))
+        k.copy(configuration = l.toVector.map(_.configuration).sorted.distinct.mkString(";"))
       }
       .sortBy { dep =>
         (dep.module.organization, dep.module.name, dep.module.toString, dep.version)

tests/shared/src/test/scala/coursier/util/PrintTests.scala

@@ -0,0 +1,28 @@
+package coursier.util
+
+import coursier.core.Attributes
+import coursier.{Dependency, Module}
+import utest._
+
+object PrintTests extends TestSuite {
+
+  val tests = TestSuite {
+    'ignoreAttributes - {
+      val dep = Dependency(
+        Module("org", "name"),
+        "0.1",
+        configuration = "foo"
+      )
+      val deps = Seq(
+        dep,
+        dep.copy(attributes = Attributes("fooz", ""))
+      )
+
+      val res = Print.dependenciesUnknownConfigs(deps, Map())
+      val expectedRes = "org:name:0.1:foo"
+
+      assert(res == expectedRes)
+    }
+  }
+
+}