Improve wording for "change package" fix for source root case

idea/src/org/jetbrains/kotlin/idea/refactoring/move/changePackage/PackageDirectoryMismatchInspection.kt

@@ -53,8 +53,11 @@ class PackageDirectoryMismatchInspection : AbstractKotlinInspection() {
                     val dirName = if (qualifiedName.isEmpty()) "source root" else "'${qualifiedName.replace('.', '/')}'"
                     fixes += MoveFileToPackageFix(dirName)
                     val fqNameByDirectory = file.getFqNameByDirectory()
-                    if (fqNameByDirectory.hasIdentifiersOnly()) {
-                        fixes += ChangePackageFix(fqNameByDirectory)
+                    when {
+                        fqNameByDirectory.isRoot ->
+                            fixes += ChangePackageFix("source root")
+                        fqNameByDirectory.hasIdentifiersOnly() ->
+                            fixes += ChangePackageFix("'${fqNameByDirectory.asString()}'")
                     }
 
                     holder.registerProblem(
@@ -105,10 +108,10 @@ class PackageDirectoryMismatchInspection : AbstractKotlinInspection() {
         }
     }
 
-    private class ChangePackageFix(val fqNameByDirectory: FqName) : LocalQuickFix {
+    private class ChangePackageFix(val packageName: String) : LocalQuickFix {
         override fun getFamilyName() = "Change file's package to match directory"
 
-        override fun getName() = "Change file's package to '${fqNameByDirectory.asString()}'"
+        override fun getName() = "Change file's package to $packageName"
 
         override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
             val directive = descriptor.psiElement as? KtPackageDirective ?: return

idea/testData/multiFileLocalInspections/reconcilePackageWithDirectory/changeToDefaultPackage/changeToDefaultPackage.test

@@ -1,5 +1,5 @@
 {
   "mainFile": "test.kt",
   "inspectionClass": "org.jetbrains.kotlin.idea.refactoring.move.changePackage.PackageDirectoryMismatchInspection",
-  "fix": "Change file's package to ''"
+  "fix": "Change file's package to source root"
 }