remove duplicated code

Author: rochala

presentation-compiler/src/main/dotty/tools/pc/completions/Completions.scala

@@ -63,7 +63,6 @@ class Completions(
       case Literal(Constant(_: String)) :: _ => Mode.Term // literal completions
       case _ => mode
 
-
   private lazy val shouldAddSnippet =
     path match
       /* In case of `method@@()` we should not add snippets and the path
@@ -114,7 +113,6 @@ class Completions(
     end if
   end includeSymbol
 
-
   def completions(): (List[CompletionValue], SymbolSearch.Result) =
     val (advanced, exclusive) = advancedCompletions(path, pos, completionPos)
     val (all, result) =
@@ -242,9 +240,8 @@ class Completions(
     def companionSynthetic = sym.companion.exists && sym.companion.is(Synthetic)
     // find the apply completion that would need a snippet
     val methodSymbols =
-      if shouldAddSnippet &&
-        (sym.is(Flags.Module) || sym.isClass && !sym.is(Flags.Trait)) &&
-          !sym.is(Flags.JavaDefined) && completionMode.is(Mode.Term)
+      if shouldAddSnippet && completionMode.is(Mode.Term) &&
+        (sym.is(Flags.Module) || sym.isClass && !sym.is(Flags.Trait)) && !sym.is(Flags.JavaDefined)
       then
         val info =
           /* Companion will be added even for normal classes now,

presentation-compiler/src/main/dotty/tools/pc/printer/ShortenedTypePrinter.scala

@@ -234,18 +234,25 @@ class ShortenedTypePrinter(
     end match
   end hoverSymbol
 
+  def isImportedByDefault(sym: Symbol): Boolean =
+    import dotty.tools.dotc.core.Symbols.defn
+    lazy val effectiveOwner = sym.effectiveOwner
+    sym.isType && (effectiveOwner == defn.ScalaPackageClass || effectiveOwner == defn.ScalaPredefModuleClass)
+
   def completionSymbol(sym: Symbol): String =
     val info = sym.info.widenTermRefExpr
     val typeSymbol = info.typeSymbol
 
-    if sym.is(Flags.Package) || sym.isClass then " " + fullNameString(sym.effectiveOwner)
-    else if sym.is(Flags.Module) || typeSymbol.is(Flags.Module) then
+    lazy val typeEffectiveOwner =
       if typeSymbol != NoSymbol then " " + fullNameString(typeSymbol.effectiveOwner)
       else " " + fullNameString(sym.effectiveOwner)
+
+    if isImportedByDefault(sym) then typeEffectiveOwner
+    else if sym.is(Flags.Package) || sym.isClass then " " + fullNameString(sym.effectiveOwner)
+    else if sym.is(Flags.Module) || typeSymbol.is(Flags.Module) then typeEffectiveOwner
     else if sym.is(Flags.Method) then
       defaultMethodSignature(sym, info, onlyMethodParams = true)
-    else if sym.isType
-    then
+    else if sym.isType then
       info match
         case TypeAlias(t) => " = " + tpe(t.resultType)
         case t => tpe(t.resultType)

presentation-compiler/test/dotty/tools/pc/tests/completion/CompletionSuite.scala

@@ -673,8 +673,8 @@ class CompletionSuite extends BaseCompletionSuite:
           |}
           |""".stripMargin,
       """|Some[?] scala
-         |SafeVarargs java.lang
          |ScalaReflectionException scala
+         |Seq[A] scala.collection.immutable
          |""".stripMargin,
       topLines = Some(3)
     )
@@ -709,8 +709,8 @@ class CompletionSuite extends BaseCompletionSuite:
           |}
           |""".stripMargin,
       """|Number: Regex
-         |NegativeArraySizeException java.lang
-         |NoClassDefFoundError java.lang
+         |NoSuchElementException java.util
+         |NoSuchFieldError java.lang
          |""".stripMargin,
       topLines = Option(3)
     )
@@ -724,12 +724,24 @@ class CompletionSuite extends BaseCompletionSuite:
           |}
           |""".stripMargin,
       """|Number: Regex
-         |NegativeArraySizeException java.lang
-         |NoClassDefFoundError java.lang
+         |NoSuchElementException java.util
+         |NoSuchFieldError java.lang
          |""".stripMargin,
       topLines = Option(3)
     )
 
+  @Test def `no-methods-on-case-type` =
+    check(
+      s"""|object Main {
+          |  val Number = "".r
+          |  "" match {
+          |    case _: NotImpl@@
+          |}
+          |""".stripMargin,
+      """|NotImplementedError scala
+         |""".stripMargin,
+    )
+
   @Test def underscore =
     check(
       s"""|object Main {
@@ -1344,7 +1356,7 @@ class CompletionSuite extends BaseCompletionSuite:
       """|object T:
          |  extension (x: ListBuffe@@)
          |""".stripMargin,
-      """|ListBuffer[T] - scala.collection.mutable
+      """|ListBuffer[A] - scala.collection.mutable
          |ListBuffer - scala.collection.mutable
          |""".stripMargin,
     )
@@ -1364,7 +1376,7 @@ class CompletionSuite extends BaseCompletionSuite:
       """|object T:
          |  extension [A <: ListBuffe@@]
          |""".stripMargin,
-      """|ListBuffer[T] - scala.collection.mutable
+      """|ListBuffer[A] - scala.collection.mutable
          |ListBuffer - scala.collection.mutable
          |""".stripMargin
     )