Fix double space in module diefinition printing

Author: nicolasstucki

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -640,7 +640,7 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
     val tparamsTxt = withEnclosingDef(constr) { tparamsText(tparams) }
     val primaryConstrs = if (constr.rhs.isEmpty) Nil else constr :: Nil
     val prefix: Text =
-      if (constr.symbol.owner.is(Module)) " "
+      if (constr.symbol.owner.is(Module)) ""
       else if (vparamss.isEmpty || primaryConstrs.nonEmpty) tparamsTxt
       else {
         var modsText = modText(constr.mods, "")
@@ -661,7 +661,9 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
       params ::: rest
     } else impl.body
 
-    val bodyText = "{" ~~ selfText ~~ toTextGlobal(primaryConstrs ::: body, "\n") ~ "}"
+    val bodyText =
+      (if (constr.symbol.owner.is(Module)) " {" else "{") ~~
+      selfText ~~ toTextGlobal(primaryConstrs ::: body, "\n") ~ "}"
 
     prefix ~ (keywordText(" extends") provided (!ofNew && parents.nonEmpty)) ~~ parentsText ~~ bodyText
   }

tests/pos/simpleCaseObject.decompiled

@@ -1,6 +1,6 @@
 /** Decompiled from out/posTestFromTasty/pos/simpleCaseObject/foo/Foo.class */
 package foo {
-  case object Foo  {
+  case object Foo {
     override def hashCode(): Int = 1045991777
     override def toString(): String = "Foo"
     override def canEqual(that: Any): Boolean =

tests/run/puzzle.decompiled

@@ -1,5 +1,5 @@
 /** Decompiled from out/runTestFromTasty/run/puzzle/Test.class */
-object Test  {
+object Test {
   def main(args: Array[String]): Unit =
     {
       println(if false then 5.0 else 53.0)