OrganizeImports: don't turn non-wildcard * into _

scalafix-rules/src/main/scala/scalafix/internal/rule/OrganizeImports.scala

@@ -782,7 +782,11 @@ class OrganizeImports(
           case i @ Importee.Unimport(_) =>
             patchSyntax(i, i.copy().syntax, dialectAlwaysRequiresBraces)
           case i @ Importee.Wildcard() =>
-            patchSyntax(i, i.copy().syntax, false)
+            // * is a valid type, which is parsed as Importee.Wildcard with
+            // the Scala 3 dialect. If the target dialect does not support
+            // star wildcard, it would be incorrectly turned into _.
+            if (i.pos.text != "*" || targetDialect.allowStarWildcardImport)
+              patchSyntax(i, i.copy().syntax, false)
           case i =>
             patchSyntax(i, i.syntax, false)
         }

scalafix-tests/input/src/main/scala/test/organizeImports/ImportWildcardType.scala

@@ -0,0 +1,12 @@
+/*
+rules = [OrganizeImports]
+OrganizeImports.removeUnused = false
+OrganizeImports.targetDialect = Scala2
+ */
+package test.organizeImports
+
+import WildcardType.*
+import WildcardType.`*`
+import WildcardType.Other
+
+object ImportWildcardType

scalafix-tests/output/src/main/scala/test/organizeImports/ImportWildcardType.scala

@@ -0,0 +1,7 @@
+package test.organizeImports
+
+import WildcardType.*
+import WildcardType.*
+import WildcardType.Other
+
+object ImportWildcardType

scalafix-tests/shared/src/main/scala/test/organizeImports/WildcardType.scala

@@ -0,0 +1,6 @@
+package test.organizeImports
+
+object WildcardType {
+  object *
+  object Other
+}